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HA-022X Implementation of High Availability Solutions for UNIX (VCS 4.0)

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HA-022X exam Dumps Source : Implementation of High Availability Solutions for UNIX (VCS 4.0)

Test Code : HA-022X
Test Name : Implementation of High Availability Solutions for UNIX (VCS 4.0)
Vendor Name : Veritas
Q&A : 140 Real Questions

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Veritas Implementation of High Availability

Carbonite and Veritas Announce Reseller Partnership | killexams.com Real Questions and Pass4sure dumps

nowadays, Carbonite, Inc. CARB, +1.17% a worldwide chief in information coverage, and Veritas applied sciences, a world leader in enterprise information protection and utility-described storage, announced a new partnership designed to deliver stronger endpoint equipment insurance plan to Veritas consumers. Veritas will act as a certified distributor and reseller of Carbonite Endpoint to its consumer base.

Carbonite Endpoint is a hybrid cloud solution that safeguards the information that resides on a company’s computer systems, laptops, capsules and smartphones. the use of file-stage backup with patented world deduplication, Carbonite makes it possible for businesses’ IT managers to mitigate information loss whereas maximizing typical performance across distributed networks. Carbonite Endpoint gives a flexible and effective information protection solution for any measurement company.

“we are very excited in regards to the prospect of working with Veritas, an extended-standing leader in business-scale facts insurance plan,” talked about Norman Guadagno, SVP advertising and marketing, Carbonite. “The endpoint is without doubt one of the most critical vulnerabilities for organizations today, and Carbonite Endpoint has proven its potential to empower IT managers to protect agencies at scale.”

“because the statistics protection needs of groups continue to evolve, and our commercial enterprise purchasers turn to us as a trusted technology dealer and associate, we agree with that providing a superior-in-classification endpoint insurance plan SaaS solution is primary,” pointed out Simon Jelley, VP Product administration Veritas technologies. “With Carbonite and Carbonite Endpoint, we now have found a associate that shares our dedication to statistics insurance plan and a solution that meets commercial enterprise consumers’ wants.”

supplies

  • gain knowledge of extra about the Carbonite statistics insurance plan Platform right here:Carbonite records insurance policy Platform
  • gain knowledge of more about the Carbonite companion application here: Carbonite accomplice program
  • About Carbonite

    Carbonite offers a robust facts insurance plan Platform for companies, together with backup, disaster recovery, high availability and workload migration technology. The Carbonite statistics protection Platform supports world organizations with at ease cloud infrastructure. To gain knowledge of greater visitwww.Carbonite.com and observe us on Twitter at @Carbonite.

    About Veritas

    Veritas applied sciences is a worldwide leader in business facts administration – our application and solutions support companies protect their mission-essential statistics. Tens of thousands of agencies, together with 97% of Fortune one hundred companies, count on us day by day to back up and recover their information, preserve it relaxed and accessible, to shield in opposition t failure and obtain regulatory compliance. In today’s digital economy, Veritas gives you technology that helps companies cut back hazards and capitalize on their most critical digital asset – their records. be taught more atwww.veritas.comor follow us on Twitter at@veritastechllc.

    View supply version on businesswire.com: https://www.businesswire.com/news/home/20190214005064/en/

    supply: Carbonite, Inc."> <Property FormalName="PrimaryTwitterHandle" cost="@Carbonite

    Media contacts (Carbonite) Sarah KingCarbonite617-421-5601media@carbonite.com Kelsey ShivelyWeber Shandwick (for Carbonite)425-306-2090wswnacarbonite@webershandwick.com Investor family members Contact (Carbonite):Jeremiah SisitskyCarbonite781-928-0713investor.relations@carbonite.comVeritas PR ContactUS ContactVeritas TechnologiesText 100 (For Veritas)Veritas@text100.comEMEA ContactVeritas TechnologiesJames Blamey +44 7467 688263James.blamey@veritas.comAPJ ContactVeritas TechnologiesBan Leng Neo +65 9771 3894BanLeng.neo@veritas.com

    Copyright company Wire 2019


    RFS Demonstrates end-To-end range Of 5G-capable options At MWC 2019 | killexams.com Real Questions and Pass4sure dumps

    RFS, the international clothier and company of end-to-end solutions for instant verbal exchange, will be showcasing its complete latitude of high performance 5G competent infrastructure at MWC 2019.

    over the last one year, RFS has labored to boost solutions to enrich the total community infrastructure for cell community business forward of 5G. This focus has viewed the enterprise experience 34% increase and work with tier one operators across the globe because it continues to design conclusion-to-conclusion solutions to remedy operator challenges.

    probably the most biggest challenges facing operators seeking to roll out 5G is the availability of device that mixes the technical performance mandatory to assist 5G, with reliability and simplicity, in a compact product form with low visible affect. RFS is helping to handle the issue with distinct 5G-equipped options. From its ‘tremendous Small cell’ range to wireless backhaul dual-band antennas, RFS is assisting operators prolong connectivity past the bottom station and penetrate dense urban areas where many 5G applications will take a seat without massive visible influence.

    This has ended in the launch of its 5G-ready latitude; these products are specifically designed to offer streamlined and future-proofed 5G options which tackle the visible, weight and space restrictions that operators have to work with when deploying new infrastructure. RFS has developed on its energetic Passive Antenna launch at MWC 2018 which consolidates base station device to cut back site footprint. Optimizing the product for handy setting up with upgradable elements RFS now presents a future-proofed solution for operators. moreover, within its small telephone range, RFS will show off the industry’s smallest small telephone diplexer solutions to streamline setting up and convey highest performance within the smallest possible house.

    Herbert Merz commented, “RFS has a long heritage in designing inventive solutions to handle essentially the most pertinent issues within the telecoms trade. Our 5G portfolio has been created in response to the challenges that operators are set to face over the next twelve months. Working closely with our OEM and operator companions, we've identified the want for ‘stealth 5G’– conclusion-to-end solutions that may also be with ease deployed and overcome the challenges operators face around space, visual have an effect on and network complexity. The result is the creation of items that remedy recognized problems and should clean the transition to 5G for operators and their shoppers alike.”

    The items RFS will be showcasing at MWC:

    lively Passive Antenna

  • Following the launch of the primary active Passive Antenna (APA) with interleaved radiating layers for three.5GHz mMIMO by means of RFS at MWC 2018, RFS has advanced the product to handle the real-world challenges operators are dealing with with 5G rollouts. in keeping with RFS’s Platform three and Platform four passive antenna codecs which encompass low band (694-960 MHz), mid and excessive band (1425-2690 MHz) antenna arrays and works with the APA to give the same (competencies) kind factor whereas together with not obligatory mMIMO capabilities at 3.5 GHz. The product has been radically demonstrated and optimized to make certain the interleaving scheme doesn't affect the performance of either the active or passive a part of the antenna.
  • additionally, RFS has developed a product implementation method to make sure a future-proofed answer with its FUSION application. This allows for operators to set up any RFS FDD passive antenna nowadays that can seamlessly be upgraded with lively antenna components to add TDD lively 5G mMIMO skill devoid of compromising efficiency and reducing TCO. The APA design capability valued clientele advantage from a future-proofed, convenient to retain solution which permits the co-existence of 4G and 5G required in distinct markets – together with Europe, the Americas and APAC.
  • high skill 5G TDD trials are being conducted in markets around the globe the place co-existence of for example 4G and 5G could be required – this contains Europe, India, the the united states and Asia.
  • twin Band Antenna

  • RFS will unveil its finished twin Band antenna options, demonstrating microwave backhaul as a attainable option to fiber to handle the calls for of 5G in urban areas. Combining excessive capacity E-band with high availability 15GHz, 18 GHz and 23 GHz, RFS is in a position to be sure consistent first-class of carrier over longer distances, with the ability and low latency to support 5G. Operators additionally improvement from a decreased TCO with decrease installing fees and tower leasing charges to easy the evolution to 5G.
  • Small cells

  • At MWC, RFS will exhibit its super small mobile latitude, which spans all machine required for 5G-competent small cell deployments. The range includes everything from extremely-compact antennas to support 2G, 3G 4G and 5G and permit network evolution, to a brand new line of 5G-able multiplexers to give most beneficial performance within the smallest footprint accessible, to smaller kind element, excessive efficiency cables and jumpers that now present a NEX10 connector alternative. The FDPL and FDPAW sequence diplexers, slightly larger than a pack of cards offer the industries smallest size and weight combined with the lowest PIM, insertion loss and optimum energy dealing with to address the challenges of community densification associated with 5G.
  • In-constructing and in-tunnel cabling

  • RFS will showcase its capacity to assist with the conclusion-to-conclusion roll out of 5G with its in-building and in-tunnel options.
  • It’s flagship radiating MIMO cable which has already set the in-tunnel world record for velocity, could be on exhibit as RFS demonstrates the applications of this and its unconditionally 5G-ready cabling solutions to deliver closing mile connectivity for operator and business consumers.
  • a variety of demos and options can be showcased on hospitality stand 2LV24, corridor 2. To installation a gathering at MWC 2018 with RFS to focus on the evolution from 4G to 5G and the way RFS can help, contact Véronique De Fournoux (veronique.de_fournoux@rfsworld.com).

    About RFSRadio Frequency programs (RFS) is a world clothier and brand of cable, antenna and tower techniques, plus lively and passive RF conditioning modules, providing complete-package options for instant infrastructure.

    RFS serves OEMs, distributors, system integrators, operators and installers within the broadcast, instant communications, land-cellular and microwave market sectors. As an ISO compliant firm with manufacturing and consumer carrier amenities that span the globe, RFS presents chopping-area engineering capabilities, superior container aid and imaginitive product design. RFS is a leader in instant infrastructure.

    For extra assistance, discuss with www.rfsworld.com.


    “State of the Hybrid Cloud” research Suggests IT professionals should focus on advice management – no longer Infrastructure | killexams.com Real Questions and Pass4sure dumps

    MOUNTAIN VIEW, Calif.--(company WIRE)--Veritas technologies, the leader in suggestions administration, today introduced the consequences of a worldwide survey indicating that nearly three-quarters of agencies continue to undertake distinctive inner most and public cloud recommendations. The findings highlight the want for corporations to undertake solid suggestions management and safety techniques.

    The examine, commissioned with the aid of Veritas and performed through Cicero group, surveyed 1,800 global IT determination makers in agencies with at least 500+ employees and at least 75TB of statistics below management. overall, the analysis printed that enterprise-important workloads within the public cloud are set to double in the subsequent 24 months – roughly the identical fee as non-crucial workloads – placing drive on IT departments to make certain their complete business services, no longer simply their infrastructure, are enormously accessible and comfy.

    The analyze examined both the price at which agencies are moving records to the cloud, utilizing each inner most and public cloud functions, as smartly as the reasoning at the back of their decisions. The analysis also appears to disprove some commonplace perceptions about cloud adoption. as an instance, one traditional view is that less important workloads will migrate to the public cloud first and at a quicker cost. whereas this may additionally have been the case early on, the look at discovered that here is shifting: enterprise-vital workloads including CRM and ERP are relocating to the cloud at the same prices statistically – from 25-30% -- as different, less crucial workloads. whereas these findings point out an extended have confidence in moving facts of all types to the cloud, it additionally translates to delivered drive for carrier suppliers to make sure excessive availability and avoid downtime, in addition to challenges IT departments to have the right information insurance plan recommendations in location that can span heterogeneous infrastructure – on and off premise.

    Key findings of the study encompass right here:

  • 38% of workloads nowadays exist in a private cloud, with 28% in a public cloud. although, these numbers are anticipated to grow at rates of 7% and 18%, respectively, over the next twelve months.
  • 74% of firms are at the moment leveraging two or greater cloud infrastructure providers to assist their workload requirements and 23% are the use of 4 or extra vendors. This capability that the burden of keeping, managing and applying the statistics throughout these heterogeneous environments will fall mostly on IT departments.
  • Geographically, Japan and Brazil paved the way in leveraging the general public cloud with roughly 50% greater workloads relocating to the general public cloud than the U.S., Canada, France and Germany.
  • When examined via business, manufacturing led the manner in migration to the general public cloud with 30% of their workloads in the public cloud, as in comparison to 24% in telecommunications, 23% in both healthcare and financial and sixteen% within the public sector.
  • multiple-third of respondents said that charge is the fundamental driver for relocating to the general public cloud, whereas the true inhibitor to public cloud use remains safety, with 50% reporting that security/insurance policy architectures remains the precise explanation for heading off the public cloud. interestingly, of folks that have adopted public cloud, security changed into the accurate driver of pride with their determination, highlighting, perhaps, that public cloud carriers deserve to enhanced articulate and promote their protection capabilities and successes.
  • A titanic variety of respondents referred to that definite workloads would at all times stay on-premises in place of migrating to the cloud. for instance, 28% state that backup and healing will continue to be on-premises, 27% will hold catastrophe recuperation out of the cloud and 26% will continue to condominium archive, records warehousing and relational or OLTP databases on-premises.
  • 81% of companies depend on provider suppliers for support with cloud implementation, as well as ongoing operations, indicating that the heterogeneous and “messy” nature of cloud will continue to be a challenge for IT departments, and repair suppliers with excessive levels of help and abilities will be helpful to companies, mainly as they migrate workloads to the public cloud.
  • “This research underlines the existing state of the hybrid cloud world,” mentioned Simon Jelley, Veritas VP of Product administration, Veritas applied sciences. “This world is greater – not less – heterogeneous, which could imply increasing complexity from an counsel management perspective. corporations must be extra vigilant than ever in picking out IT blind spots and expertise safety risks to avoid unplanned downtime or an assistance crisis.”

    The finished “State of the Hybrid Cloud” file can also be downloaded here.

    About Veritas technologies

    Veritas applied sciences enables companies to harness the power of their information, with information management options serving the realm’s largest and most complex environments. Veritas works with organizations of all sizes, including 86 p.c of world Fortune 500 organizations, improving records availability and revealing insights to pressure aggressive knowledge. www.veritas.com

    Veritas, the Veritas logo, NetBackup, and Backup Exec are emblems or registered logos of Veritas technologies LLC or its affiliates in the U.S. and different countries. different names may be trademarks of their respective house owners.


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    EMC and Microsoft Form Strategic Global Alliance | killexams.com real questions and Pass4sure dumps

    HOPKINTON, Mass., and REDMOND, Wash., Feb. 1, 2000 — EMC Corp. and Microsoft Corp. today announced a strategic alliance designed to help organizations worldwide more effectively build and deploy highly reliable, available and manageable business solutions using the Microsoft® Windows® 2000 Server network operating system. The companies will combine Windows 2000, leading storage solutions and services from EMC, along with end-to-end solutions and services from EMC’s Data General division to address the computing requirements of customers with the most demanding information technology environments.

    As part of the alliance, Data General is offering the industry’s first 99.9 percent uptime service guarantee for Windows 2000, enhancing its high-availability solutions for customers running their mission-critical operations on Microsoft enterprise platforms. This uptime service guarantee will cover clustered Data General servers running Windows 2000 Advanced Server or Windows 2000 Data Center Server, when available.

    In addition, EMC today announced it is a Windows 2000 Global Launch Partner and will join Microsoft in more than 60 locations worldwide on Feb. 17, 2000, with other industry leaders showcasing significant investments in the Windows 2000 family of operating systems through solutions, services and support.

    Initially, the global alliance will focus on the following:

  • To help customers migrate to Windows 2000 while managing, sharing and protecting their enterprisewide information, the companies will develop and market storage networking solutions for the Windows NT® Server and Windows 2000 operating systems using EMC storage systems and software.

  • To provide highly available, manageable information infrastructures that simplify the customer experience, the companies will deliver a suite of packaged, end-to-end solutions combining Data General’s“In-a-Box”products, Cluster-in-a-Box , Exchange-in-a-Box and TermServer-in-a-Box ; lifecycle services, including a 99.9 percent uptime service guarantee for Windows 2000, Windows NT Server 4.0, Exchange Server and SQL Server TM 7.0; and fixed priced support and training for high-availability platforms delivered through Data General’s Microsoft Certified Support Center.

  • To enable customers to upgrade easily from Microsoft Exchange Server 5.5 toExchange 2000 Server and establish highly available, scalable and manageable Exchange messaging and collaboration environments, the companies will develop and market integrated solutions using servers and services from Data General as well as EMC’s storage solutions and services.

  • To meet the unique, mission-critical requirements of the health-care market, Data General and Microsoft will drive the adoption of and migration to Windows 2000 Server-based solutions for hospitals, managed-care providers and physician offices.

  • “HomeLife embarked on an early deployment of Windows 2000 in an ambitious project to reinvent our entire IT infrastructure,”said Christopher Smith, chief information officer for HomeLife, formerly the furniture division of Sears, Roebuck and Co. and one of the largest furniture retailers in the United States.“Because of the successful working relationship between Microsoft, Data General and EMC, we have already started to see the high-availability, reliability and manageability benefits of our implementation. We have been impressed by the consistent level of cooperation, dedication and support we have received and believe that this alliance will afford even more opportunities for us to ensure the future success of our business solutions.”

    To support the initiatives of the alliance, the companies have invested funds for joint marketing, certification and training on Microsoft technologies. EMC and Data General will train and certify 400 professionals as Microsoft Certified Solution Developers and Microsoft Certified Systems Engineers in the next 12 months. Data General has established Microsoft-focused Solution Centers that will be used to develop, deliver and support Microsoft-based business solutions and to demonstrate the scalability, manageability, interoperability and business value of the Microsoft platform.

    In addition, EMC’s Data General division will provide global support to customers 24 hours a day, seven days a week, including solutions development in its target markets. Data General will engage Microsoft Premier Support Services to assist in providing this level of service for enterprise customers.

    Roy Sanford, EMC’s vice president of Enterprise Alliances, said,“The rapid growth of Windows-based information and the increased reliance on these systems for mission-critical applications is driving customer requirements for more effective ways to manage, share and protect that information. This alliance is a commitment by both companies to providing customers around the world with the most advanced storage systems and software to meet those requirements.”

    “Customers are looking for end-to-end solutions that ensure the rapid and reliable deployment of Windows 2000 and other emerging technologies designed to yield breakthroughs in value,”said Deborah Willingham, vice president of Windows Marketing at Microsoft.“Microsoft, EMC and Data General have worked together for several years on enterprise customer and technology-related initiatives. We are convinced that the depth of experience shared by our companies will enable our customers to implement enterprise solutions with confidence to realize significant business value quickly.”

    “We are delighted to team with Microsoft to make this groundbreaking announcement,”said Bob Dutkowsky, president of EMC’s Data General division.“We believe that this unique combination of dedicated expertise will enable businesses to dramatically reduce the complexity and deployment time of highly available, high-performance Microsoft solutions throughout the enterprise. In addition, we are confident that this agreement will further our vision of a consolidated, simplified and controlled computing infrastructure for the enterprise.”

    About EMC

    EMC Corp., a Fortune 500 company based in Hopkinton, Mass., is the world’s technology and market leader in the rapidly growing market for intelligent enterprise storage systems, software, networks and services. The company’s products store, retrieve, manage, protect and share information from all major computing environments, including Windows NT, Windows 2000, UNIX, Linux, mainframe and other platforms. The company has offices worldwide, trades on the New York Stock Exchange under the symbol EMC, and is a component of the S & P 500 Index. For further information about EMC and its storage solutions, EMC’s corporate Web site can be accessed at http://www.emc.com/ .

    Data General, a division of EMC, is a major supplier of consolidated computing solutions for customers worldwide. The division’s products include Microsoft Windows NT, Windows 2000- and UNIX-based AViiON &#210; servers and related software and services. Strategic alliances with leading software vendors and systems integrators enable Data General to deliver complete solutions that meet customers’ business need to simplify, consolidate and control information technology infrastructures. Additional information on Data General, its products and services is available on the Internet at http://www.dg.com/ .

    About Microsoft

    Founded in 1975, Microsoft (Nasdaq“MSFT”) is the worldwide leader in software for personal and business computing. The company offers a wide range of products and services designed to empower people through great software – any time, any place and on any device.

    EMC and Data General are registered trademarks of EMC Corp. AviiON, Cluster-in-a-Box and Exchange-in-a-Box are registered trademarks, and TermServer-in-a-Box is a trademark of Data General, a division of EMC.

    Microsoft, Windows and Windows NT are either registered trademarks or trademarks of Microsoft Corp. in the United States and/or other countries.

    All other brand names and product names referenced in this press release are trademarks or registered trademarks of their respective holders.

    This release contains“forward-looking statements”as defined under the Federal Securities Laws. Actual results could differ materially from those projected in the forward-looking statements as a result of certain risk factors, including but not limited to: (i) component quality and availability; (ii) delays in the development of new technology and the transition to new products; (iii) competitive factors, including, but not limited to, pricing pressures in the computer storage and server markets; (iv) the relative and varying rates of product price and component cost declines; (v) economic trends in various geographic markets and fluctuating currency exchange rates; (vi) deterioration or termination of the agreements with certain of the company’s resellers or OEMs; (vii) the uneven pattern of quarterly sales; (viii) risks associated with strategic investments and acquisitions; (ix) year 2000 issues; and (x) other one-time events and other important factors disclosed previously and from time to time in EMC’s filings with the U.S. Securities and Exchange Commission.

    Note to editors: If you are interested in viewing additional information on Microsoft, please visit the Microsoft Web page at http://www.microsoft.com/presspass/ on Microsoft’s corporate information pages.


    Implementing SQL Server AlwaysOn Availability Groups on ECS Instances | killexams.com real questions and Pass4sure dumps

    Introduction

    SQL Server is an open-source relational database management system (RDBMS). Its primary function is to store and retrieve data when required by other applications. It runs on various operating systems, such as Linux, UNIX, and Windows and across a wide range of applications.

    The SQL Server AlwaysOn feature was made available in the SQL Server 2012 release. The AlwaysOn availability group boasts of a high-availability and disaster recovery solution. It replaces enterprise-level database image solutions to maximize the availability of a set of user databases for the enterprise. This feature sparked a revolutionary change in the industry.

    The solution implements multiple readable copies as well as convenient read and write separation schemes. It outperforms Database Mirroring + Replication for achieving read and write separation with respect to availability and reliability. Several features may have restrictions in versions earlier than SQL Server 2016. However, post release of the 2016 version, SQL Server became more user-friendly and compliant with the “customer first” principle. For example, you can now achieve no-domain-control deployment and enjoy as many as nine available copies.

    Alibaba Cloud ECS Instances

    The Alibaba Cloud ECS allows you to load applications with multiple operating systems and manage network access rights and permissions. Within the user console, you can also access the latest storage features, including auto snapshots, which is perfect for testing new tasks or operating systems as it allows you to make a quick copy and restore later. It offers a variety of configurable CPU, memory, data disk and bandwidth variations allowing you to tailor each Instance to your specific needs.

    Let us see how to implement AlwaysOn availability groups with no domain control on Alibaba Cloud ECS instances.

    1. Prerequisites

    Before we begin detailing the architecture solution, let us look at the prerequisites for the deployment process.

    1.1 Hardware Conditions:

    Container ECS: Recommended: 4-core CPU or above, 8GB memory or above. Mount SSD cloud disks as ECS.

    1.2 Software conditions:

    You would need the following software with the listed specifications:

    ● .NET Framework 4.0 or above● Powershell 5.0 or above● Windows Server 2016 64-bit Data Center Edition (either Chinese or English edition)● SQL Server 2016 64-bit Enterprise Edition (It requires Enterprise Edition. Standard Edition can only implement Basic Availability)

    Architecture Diagram

    The following figure shows the simple architecture of implementation on ECS instances. It also demonstrates a typical software solution for SQL Server AlwaysOn availability groups.

    Figure 1.

    Overview of Core Components

    Let us now discuss the core components of the solution.

    1. Architecture Overview

    The figure shows a “2 + 3” high-availability and disaster-tolerant solution. The “2” refers to primary and secondary database copies. These primary and secondary databases use sync mode to enable automatic failover between availability groups of the database. The condition for automatic failover is such that the server must utilize the synchronous replication mode. Also, the databases must have automatic failover settings enabled.

    The “3” refers to read-only copies that use async, or asynchronous replication mode, which takes into account the performance of multiple copies. For writing data, two copies (primary and secondary) are adequate. You can set all other copies to asynchronous replication. Additionally, there is an access issue to consider for ECS to deploy listeners. Therefore, to meet the solution requirements, the server allows only two synchronous copies. In fact, AlwaysOn availability group can only have up to three synchronous copies, which is enough to prove that Microsoft cares about this performance problem quite a bit.

    2. Virtual Private Cloud (VPC)

    Being VPC-based is an underlying network environment requirement. If you deploy databases in a classic network, you will run into serious issues due to the absence of Intranet IP addresses. However, if it is a VPC, resolving the problem is possible. AlwaysOn deployment will produce two virtual IP addresses. As a result, the two IP addresses must be private and remain unoccupied. Otherwise, the cluster and the listener may fail to work normally, and HA switch won’t function properly.

    3. Highly Available (HA)

    Users might often ask, why do we need HA? If you deploy AlwaysOn on ECS instances, you may run into listener failures.

    The inability to use the listener IP address to access database instances from a non-primary node causes listener failure. The listener failure is an obstacle preventing cloudization. In fact, it is associated with VPC network implementation. While the listener happens to take the Address Resolution Protocol (ARP) protocol, its resolution is not possible. HAVIP (Highly Available Virtual IP) is an HA solution with primary-secondary high-availability architecture under VPC. It provides the capability to access instances using VIP (Virtual IP) between primary and secondary instances without switching the IP address. However, you need to implement HA and heartbeat check on your own. This coincides with AlwaysOn’s failover detection, diagnosis and switch mechanisms.

    Furthermore, HAVIP + AlwaysOn can solve problems caused by listener failures. However, the system allows HAVIP to use only two nodes.

    We use two synchronous nodes (primary and secondary) to implement write HA. Also, we use three asynchronous read-only copies to implement reads, which fits into this scenario appropriately. The number of read-only copies may vary from one to two or further to seven. However, the number of nodes available for failover must allow votes of greater than or equal to three (nodes with domain control can use the shared folder to act as a VOTE).

    This may give rise to the question — How can we access so many read-only copies? Read further for an answer to this question.

    4. Server Load Balancer

    Server Load Balancer is designed to address read-only nodes. Ideally, this applies if you do not need Server Load Balancer to assign weights or implement load balancing automatically. You can also directly connect to the IP addresses of read-only copies. This is particularly in the case of deployment of web apps in a distributed approach. Therefore, it is possible to connect different web apps to different read-only nodes. Nodes for writes are restricted to do this as write nodes only have one copy.

    5. Elastic IP Address (EIP)

    An Elastic IP address is a public IPv4 address designed for dynamic cloud computing. Using an EIP, users can mask the failure of an instance or software. However, in this scenario, an EIP is not necessary. If you want to access database instances from outside the VPC, you can bind an EIP to an HAVIP and an ECS IP address. Note that it is impossible to bind Server Load Balancer to EIP. We do not recommend EIP since access in VPC is relatively safe.

    6. Elastic Compute Service (ECS)

    Elastic Compute Service (ECS) is a core service that enables users to launch new instances immediately to meet with real-time demand. ECS is the most basic instance with no special requirements.

    7. Windows Cluster

    Windows Cluster is crucial to this solution because operations for creating clusters for nodes with no domain control are often different. Also, DNS servers may even be absent. This is a new feature of Windows Server 2016. It brings with itself the advantage of independence from the complexity of domain control. Additionally, it also adds complexity to AlwaysOn deployment. Domain control not only has to consider deployment and HA problems but also needs to consider O&M issues, which often is a bother. Windows Cluster with no domain control, despite limited functionality, is sufficient to meet conditions for deploying AlwaysOn. You can refer to the deployment plan, discussed further in this article, for more details.

    8. AlwaysOn Availability Group

    AlwaysOn deployment uses SQL Server 2016 since this version supports non-domain-control deployment. The difference lies in whether domain control exists. While the security authentication modes of corresponding nodes will change — mutual authentication is required using security certificates.

    Domain control is fairly straightforward, relying on the security authentication mechanism. The complexity of deployment manifests the same. Another factor that is worth mentioning is the listener, which cannot normally function in a VPC. Therefore, implementation of read and write separation requires HAVIP along with Server Load Balancer. Listener access to database instances is not a very elegant issue. If it is read-only access, there will be a read-only option on the connection string. This might confuse you in considering read and write as two different strings.

    Similar to HAVIP + Server Load Balancer, many may mistakenly assume that a string solves the problem. However, it is practically impossible.

    Let us now look into the deployment plan.

    Deployment Plan

    The following section describes the deployment of a stand-alone Windows Server 2016 + SQL Server 2016 environment systematically.

    Before you begin the deployment, it is necessary that you have the following as prerequisites.

    1. Prerequisites 1.1 Hardware Conditions:

    Container ECS: Recommended: 4-core CPU or above, 8GB memory or above. Mount SSD cloud disks as ECS.

    1.2 Software conditions:

    You would need the following software with the listed specifications:

    ● .NET Framework 4.0 or above● Powershell 5.0 or above● Windows Server 2016 64-bit Data Center Edition (either Chinese or English edition)● SQL Server 2016 64-bit Enterprise Edition (It requires Enterprise Edition. Standard Edition can only implement Basic Availability)

    1.3 Network requirements

    Users must remember that AlwaysOn does not need dual NICs. Dual NICs cannot enable separate network connections of Windows Cluster and AlwaysOn. Some customers require dual NICs for the sake of heartbeat, which is unnecessary. Dual NICs can improve redundancy but not for heartbeat.

    1.4 Demo Environment

    The demo environment should fulfill the following prerequisites:

    ● .NET Framework 4.0 ● Powershell 5.1 ● Windows Server 2016 64-bit English Data Center Edition ● SQL Server 2016 64-bit English Enterprise Edition + SP1 ● ECS based on VPC ● High-performance SSD cloud disks

    Once you are sure of satisfying the prerequisites, you can move forward with preparing an environment for deployment.

    2. Prepare Environment for Deployment

    Firstly, apply for an ECS type. You must remember that the recommended memory is 8GB or above, the CPU is 4-core or above and the demo environment is 2-core CPU, 4GB memory. The network type must be VPC.

    3. Modify the Host Name

    Since images produce ECS instances, some of them may share the same name. While this problem is rare in VPC, to ensure absolute security, modify the host name to shorter than 15 characters and immediately restart the host. You can also manually alter the name by referring to the Powershell command, which is as follows:

    Rename-Computer -NewName “ServerName” -restart -force

    4. Install SQL Server Instances

    During installation, pay attention to setting a reasonable launching account, which can be a network service or a local account. However, if you use a local account, you need to set a uniform password for each ECS instance. We recommend you use a network service. After the installation is complete, add the network service to the SQL Server account, and set the server role to sysadmin. Additionally, maintain full consistency between at least the user database and the log file path of each ECS installation instance. Note that this is necessary for AlwaysOn deployment. Otherwise, an error may occur later during database creation. We recommend that all installation actions be consistent, as it is a best practice. You can click Next Step or use default installation for installing databases.

    5. Install SQL Server Management Studio

    Moving to the next step, we suggest you install SQL Server Management Studio (SSMS). SSMS in SQL Server 2016 is available for independent installation. The uniform engine installer does not include the SSMS, and hence you need to download it separately. The reason for installing SSMS is that you may need SQLPS (SQL Powershell).

    6. Create a Unified Windows Account

    Since this solution is not a stand-alone solution, you need to add an account with the same account name and password to ensure successful deployment of Windows Cluster and add the account to the administrators’ group. You can use administrator; however as a best practice, do not use it as the unified password. You can create it manually, or use the following cmd command:

    net user Win_Account " xxxxxx" /addnet localgroup administrators Win_Account /addWMIC.EXE Path Win32_UserAccount Where Name="Win_Account" Set PasswordExpires="FALSE" 7. Disable UAC Remote Restrictions

    You can disable the UAC remote restrictions using the following:

    Powershell command: new-itemproperty -path HKLM:SOFTWAREMicrosoftWindowsCurrentVersionPoliciesSystem -Name LocalAccountTokenFilterPolicy -Value 1

    8. Install Windows Failover Cluster Feature

    This is a mandatory and basic structure. AlwaysOn must grow on the Windows Cluster. Powershell command:

    Install-WindowsFeature –Name Failover-Clustering –IncludeManagementTools

    9. Modify the DNS Suffix of a Windows Host

    This solution involves a stand-alone control. To make the solution successfully run under Windows Cluster, you need to add the uniform suffix to the hostname for identification purposes. You can modify it through the UI, or use the Powershell command:

    $ParentKeyPath = "HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters"$DnsSuffix="aliyunrds.com"New-ItemProperty -Path $ParentKeyPath -Name "NV Domain" -Value $DnsSuffix -PropertyType String 10. Change the Host’s Static IP Address

    Strictly speaking, you can start to use DHCP for configuration starting from Windows Server 2008. However, we suggest you use a static IP address to configure the host’s network connection. You can use the UI or the Powershell command for configuration. However, remember to check the DNS configuration and adjust it as necessary. Modify the script on your own or you can adjust it manually. You can do that by using the following:

    $IPType = "IPv4" $Adapter = Get-NetAdapter | Where-Object {$_.Status -eq 'up' -and $_.name -ne 'loopback'} $IpAddress=((($Adapter | Get-NetIPConfiguration).IPv4Address) | Where InterfaceAlias -ne "loopback").IPAddress$PrefixLength=((($Adapter | Get-NetIPConfiguration).IPv4Address) | Where InterfaceAlias -ne "loopback").PrefixLength$Gateway=((Get-NetIPConfiguration).Ipv4DefaultGateway).NextHop If (($adapter | Get-NetIPConfiguration).IPv4Address.IPAddress) {$adapter | Remove-NetIPAddress -AddressFamily $IPType -Confirm:$false} If (($adapter | Get-NetIPConfiguration).Ipv4DefaultGateway) {$adapter | Remove-NetRoute -AddressFamily $IPType -Confirm:$false} # config static ip address$Adapter | New-NetIPAddress -AddressFamily $IPType -PrefixLength $PrefixLength -IPAddress $IpAddress -DefaultGateway $Gateway 11. Modify the Host’s Hosts File

    The file is located at hosts under C:WindowsSystem32driversetc. You need to map the name and DNS suffix of every host along with the IP addresses. You can complete this with the cmd command:

    copy C:\Windows\System32\drivers\etc\hosts C:\Windows\System32\drivers\etc\hosts_2017033141131echo 172.16.18.247 iZbp1ehi2dopyqC.aliyunrds.com >> C:\Windows\System32\drivers\etc\hostsecho 172.16.18.246 iZbp1ehi2dopyqZ.aliyunrds.com >> C:\Windows\System32\drivers\etc\hostsecho 172.16.18.248 iZbp1ehi2dopyqA.aliyunrds.com >> C:\Windows\System32\drivers\etc\hosts 12. Create Windows Cluster

    The next step involves creating the windows cluster. The latest version of Windows Server 2016 supports cluster creation through UI, but you can also choose to create the cluster through the Powershell command. You need to specify staticAddress, which is the IP address in the VPC. Be careful not to occupy it:

    New-Cluster –Name clus-aliyun0001 -Node iZbp1ehi2dopyqC.aliyunrds.com,iZbp1ehi2dopyqZ.aliyunrds.com,iZbp1ehi2dopyqA.aliyunrds.com -AdministrativeAccessPoint DNS -StaticAddress 172.16.18.101

    13. Set Arbitration Mechanism for Windows Cluster

    Non-domain-control AlwaysOn availability groups only support arbitration through majority nodes or based on Microsoft cloud files. Alibaba Cloud only supports the majority nodes mode. As a result, you have to deploy at least three nodes for your Windows Cluster. If you deploy four nodes, make sure to set one of them to zero voting rights. If you only need two database copies, you can use two ECS instances, with one serving as an AlwaysOn node and the other only joining the Windows Cluster.

    Set VOTE: $node = "Always OnSrv1" (Get-ClusterNode $node).NodeWeight = 0 Set no-witness: Set-ClusterQuorum -NoWitness Set majority-node arbitration: Set-ClusterQuorum –NodeMajority 14. Set Interval of Windows Cluster Failovers

    You may observe in your testing process that after several failovers, automatic failover ceases to function after some time. This is because Windows Cluster imposes a limit on the number of automatic failovers for each resource group within a certain period. If you want to increase the limit of automatic failovers to, say 30 failovers, use the following command.

    (Get-ClusterGroup “Cluster Group”).FailoverThreshold = 30

    15. Enable the Database AlwaysOn Feature

    You must enable the database AlwaysOn feature. Below is an image for your reference.

    Figure 2.

    Import-Module SQLPSEnable-SqlAlwaysOn -Path SQLSERVER:SQLLocalHostDefault -Force

    16. Configure AlwaysOn Security Settings

    To do this, you need to create all the instance certificates first, then copy them to the directory of each ECS instance and then rerun them. For example, you have three host instances 001, 002 and 003.

    ● On Instance 001, you need to create the certificates backed up from Instance 002 and Instance 003.● On Instance 002, you need to create the certificates backed up from Instance 001 and Instance 003. ● Similarly, on Instance 003, you need to re-create the certificates of Instance 001 and Instance 002. Instances must authenticate each other to communicate.

    Below are the steps of the SQL statements:

    Step 1

    CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'xxxxxx' CREATE CERTIFICATE cer_alwayson_001WITH SUBJECT='alwayson 001 local certificate',EXPIRY_DATE='9999-12-31' EXEC xp_create_subdir 'C:\software\cerficates' BACKUP CERTIFICATE cer_alwayson_001TO FILE='C:\software\cerficates\cer_alwayson_001.cer' CREATE ENDPOINT Endpoint_MirroringSTATE = STARTEDAS TCP (LISTENER_PORT = 5022, LISTENER_IP = ALL)FOR DATABASE_MIRRORING (AUTHENTICATION = CERTIFICATE cer_alwayson_001, ENCRYPTION = REQUIRED ALGORITHM AES, ROLE = ALL)

    Step 2

    CREATE LOGIN alwayson_user WITH PASSWORD='xxxxxx',CHECK_POLICY=OFF USE MASTERGOCREATE USER alwayson_user FOR LOGIN alwayson_user

    Step 3

    : create trusted certificate /* To do this, you need to create all the instance certificates first, and then copy them to the directories of each ECS instance and then rerun them. For example, on Instance 001, you need to create the certificates backed up from Instance 002 and Instance 003. On Instance 002, you need to create the certificates backed up from Instance 001 and Instance 003. Similarly, on Instance 003, you need to re-create the certificates of Instance 001 and Instance 002. */

    CREATE CERTIFICATE cer_alwayson_002 AUTHORIZATION alwayson_userFROM FILE=’C:softwarecerficatescer_alwayson_002.cer’

    CREATE CERTIFICATE cer_alwayson_003 AUTHORIZATION alwayson_userFROM FILE=’C:softwarecerficatescer_alwayson_003.cer’

    — step4:grant connection rightGRANT CONNECT ON ENDPOINT:: Endpoint_Mirroring TO alwayson_user

    17. Create a Database on the Instance and Make a Full Backup

    The system creates a database that is imperative for creating AG later. The Backup is necessary for copy replication because you will be unable to establish copy replication without a transaction log point.

    Use the following command for the same:

    CREATE DATABASE rdsystemBACKUP DATABASE rdsystem TO DISK=’C:softwarerdsystem.bak.full.first’

    18. Create AG on the Primary Copy

    Once the creation of the database commences, you now have to create the AG on the primary copy. We recommend beginners create AG using the UI because the wizard facilitates the creation. Then follow the prompted instructions. Below are some screenshots for your reference.

    Figure 3.

    You can also use the SQL commands:

    CREATE AVAILABILITY GROUP [ag-aliyun0001]WITH (AUTOMATED_BACKUP_PREFERENCE = SECONDARY,DB_FAILOVER = OFF,DTC_SUPPORT = NONE)FOR DATABASE [db1]REPLICA ON N'IZBP1EHI2DOPYQA' WITH (ENDPOINT_URL = N'TCP://iZbp1ehi2dopyqA.aliyunrds.com:5022', FAILOVER_MODE = AUTOMATIC, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, BACKUP_PRIORITY = 50, SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL)),N'IZBP1EHI2DOPYQC' WITH (ENDPOINT_URL = N'TCP://iZbp1ehi2dopyqC.aliyunrds.com:5022', FAILOVER_MODE = AUTOMATIC, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, BACKUP_PRIORITY = 50, SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL)),N'iZbp1ehi2dopyqZ' WITH (ENDPOINT_URL = N'TCP://iZbp1ehi2dopyqZ.aliyunrds.com:5022', FAILOVER_MODE = AUTOMATIC, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, BACKUP_PRIORITY = 50, SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL));

    If you need to restore the database to a secondary copy manually, backup the database and logs, and then restore the secondary copy to the “roll forward” state. Alternatively, you can share a folder and allow the wizard to complete the process. Finally, we recommend a method for creating AG. Add the SEEDING_MODE = AUTOMATIC option to each copy of the above script, specifically:

    N'iZbp1ehi2dopyqZ' WITH (ENDPOINT_URL = N'TCP://iZbp1ehi2dopyqZ.aliyunrds.com:5022', FAILOVER_MODE = AUTOMATIC, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, BACKUP_PRIORITY = 50,SEEDING_MODE = AUTOMATIC, SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL))Then run the following command on each secondary copy node: SECONDARY ALTER AVAILABILITY GROUP [ag-aliyun0001] GRANT CREATE ANY DATABASE 19. Add AG to the Secondary Copy and Add the Database

    To add AG to the secondary copy and add the database using the following command:

    ALTER AVAILABILITY GROUP [ag-aliyun0001] JOIN;ALTER DATABASE [db1] SET HADR AVAILABILITY GROUP = [ag-aliyun0001];

    20. Create a Listener

    The access to A created listener is not possible from external non-primary nodes, but you can use HAVIP to solve this problem. Just use the UI to create it and select Next Step directly. The screenshot below should act as a reference.

    Figure 4.

    At this point, an AlwaysOn availability group has completed creation. We would request you to have a look at the three figures again. You will notice that they are captured from different copies. Part of their content is different, distinguishing the primary copy and the secondary copy, as well as the synchronous and asynchronous replication relationships. Below are the three screenshots for your reference.

    Figure 5.

    Figure 6.

    Figure 7.

    Let us now proceed to create HAVIP

    21. Create HAVIP

    Consult the VPC/HAVIP product manager to activate the HAVIP whitelist and then associate it with the two synchronized ECS instances in the console. Note that the ECS instances must be the ones for synchronously replicated database copies. HAVIP must be consistent with the listener IP address and the listening port must be consistent with the listener port.

    22. Create a Read-Only Server Load Balancer

    This is very simple. Just bind the read-only ECS instance to the Server Load Balancer and specify the weight.

    This concludes our list of steps involved in the deployment of a stand-alone Windows Server 2016 + SQL Server 2016 environment. We will now move towards understanding the precautions that users must follow during the entire deployment process.

    Precautions to be Followed During Deployment

    ● There is no domain control in this solution; hence there are numerous security requirements on configuration;● If you need to enable domain control, AlwaysOn security configuration will no longer be required;● The solution is a beta of a productized solution, with the product scheduled for launch in the near future. The productized solution will have some permission limitations with high automation competency. It will be a PaaS service.

    Conclusion:

    This article primarily focuses on the deployment of SQL Server 2016 that offers dual master and multiple read replicas. The AlwaysOn group boasts of a high-availability and disaster recovery solution. We discussed the prerequisites that one needs to have in place before embarking on the deployment process. The steps involved in the deployment are a set of 22 steps that users must follow. Users must take note of the difference in distinguishing the primary copy from the secondary copy, as well as the synchronous and asynchronous replication relationships.

    Reference:

    https://www.alibabacloud.com/blog/Implementing-SQL-Server-AlwaysOn-Availability-Groups-on-ECS-Instances_p378984?spm=a2c41.11187604.0.0


    Network Design Strategies | killexams.com real questions and Pass4sure dumps

    This chapter, from Upgrading and Repairing Networks, 5e, looks at the network's logical and physical design to assist your planning when creating a new network.

    This chapter is from the book 

    Many types of networks were discussed in Chapter 1, "A Short History of Computer Networking," from ARPANET to TCP/IP. And in Chapter 2, "Overview of Network Topologies," you learned about the various topologies you can employ when designing and creating a local area network (LAN), and we also looked at some scenarios in which several networks were connected to form a wide area network (WAN). In this chapter, we will look at another aspect of creating a network: the network's logical and physical design. The physical aspects of your LAN will depend on the underlying physical transport technology—Ethernet or Token-Ring, for example, or possibly ATM, which is supported as a LAN protocol in products such as Windows 2000/XP, Windows Server 2003, and Linux. Depending on which technology you use, there will be one or more LAN topologies from which to choose.

    Before you can begin to design a physical network, however, you first must determine your needs. What services must you provide to your user community? What are the resources you'll need? If you have to compromise, what will it take to satisfy the most users or to provide the more important services? You then will have to take into account network protocols, applications, network speed, and, most important, network security issues; each of these figures into a network's logical design. Another important factor your management will probably force you to consider is cost—you can't forget the budget. These factors make up the logical design for your network. You first should decide what you need and what it will take to provide for those needs.

    If you are creating a new network and purchasing new applications, you will probably spend most of your time considering the licensing and other financial costs (training users, network personnel, and so on). If you are upgrading older applications, several other factors come into consideration. Many applications that were coded using COBOL, BASIC, FORTRAN, and other languages that helped jumpstart the computer age may have built-in network functionality based on older proprietary network protocols. If this is the case with your network, you have to consider several things. What will it cost to update thousands of lines of code (or more) to more modern versions of the same programming language? What will it cost to upgrade these programs to newer object-oriented languages? To save money, can you upgrade part of your network and use gateway hardware/software to connect to older network components?

    Because of the costs associated with coding applications that were created many years ago, and the expenses that will be required to update them to modern programming languages, you may be forced to maintain legacy applications for a few years while replacement applications are designed and created. You may find a packaged application that can be used to replace older programs. This problem will apply mostly to proprietary computer architectures, instead of Windows or Unix platforms. If you can simply make minor changes and compile the source code so that it will run on a newer operating system, your costs will be much less than if you have to re-create the applications your users need from scratch. Another cost associated with upgrading to new programs is training users and help-desk personnel.

    When you plan a logical network design, you can start from one of two places. You can design and install a new network from scratch, or you can upgrade an existing network. Either way, you should gather information about several important factors before you begin the logical design. For example, depending on the services that will be provided to clients, you might need to analyze the possible traffic patterns that might result from your plan. Locate potential bottlenecks and, where possible, alleviate them by providing multiple paths to resources or by putting up servers that provide replicas of important data so that load balancing can be provided. The following are other factors to consider:

  • Who are the clients? What are their actual needs? How have you determined these needs—from user complaints or from help-desk statistics? Is this data reliable?
  • What kinds of services will you provide on the network? Are they limited in scope? Will any involve configuring a firewall between LANs? And if so, that still doesn't account for configuring a firewall to enable access to the Internet.
  • Will you need to allow an Internet connection for just your internal network's users, or will use you need to allow outside vendors access to your network? One example that comes to mind is the Internet Printing Protocol (see Chapter 24, "Overview of the TCP/IP Protocol Suite"). What will it cost to evaluate what kind of services user groups need to access from the Internet? Will you need to allow all users to use email—both within the internal network and through the firewall on the Internet? The same goes for what sites users will be allowed to access using a network browser and other network applications. Will you have users who work from home and require dial-in or VPN access through the Internet?
  • Can your users tolerate a little downtime now and then due to network problems, or is it necessary to provide a high-availability network? Will you need clustered servers to provide for a high degree of uptime, or do your users' applications not suffer from a temporary loss of the use of a server? To provide for maximum uptime, can you afford to build redundancy into your network? For example, Chapter 2 discusses redundant topologies that can be used to prevent a single point of failure from making the network (and its resources) unavailable. Chapter 11, "Network Attached Storage and Storage Area Networks," describes methods you can use to mirror data at geographically distant locations.
  • In an existing network, will you keep the current protocol or upgrade to a different protocol standard? If you create a network from scratch, what factors should affect your network protocol decision? Ethernet is the most popular LAN technology in the world today. TCP/IP is the most popular protocol suite that runs on Ethernet. Yet there are cases in which other technologies have their niches. Consider the implications (such as support costs and security) to maintain older, proprietary protocols.
  • Who Are Your Clients?

    This seems like a very simple question. However, I'm not saying, "What are your clients' names and how well do you know their children?" I am referring instead to your knowledge of the job descriptions for the users on the network. You need to assess work patterns for various departments so that you can appropriately place servers, high-bandwidth links, and other such things in the appropriate physical location of the network. If most of the network traffic you expect to see will come from the engineering department, you'll need to provide that department with a large data pipe. In Chapter 4, "Upgrading Strategies and Project Management," you'll find more information about surveying the user community to come up with a plan that places resources where they are needed.

    What Kinds of Services or Applications Will the Network Offer?

    Of course, everyone knows that the most important function of a network today is to support multiuser gaming. Seriously, though, you need to make a list of the kinds of applications currently in use, as well as a list of those requested by users. Each application should have a written risk assessment document that points out potential security problems, if any. Typical network applications today include FTP, telnet, and, of course, browsing the Web. There are "secure" versions of these applications and there are versions that leave a door wide open into your network. Whatever list of applications you chose to support over the network, keep in mind two things:

  • Is the application safe? Most applications today come in secure versions or can be used with a proxy server to help minimize the possibility of abuse. Yet, as we all have seen, even the largest corporations are targets at times, and those companies have the staff that should be able to prevent these things from happening. Because proxy servers are an important component of firewalls, this subject is covered in greater detail in Chapter 45. If you want a secure network, this is highly recommended reading!
  • Does one application overlap another? Every user has his or her favorite application. Some people like one word processor, whereas others prefer a different one. But when dealing with applications or application suites (such as Microsoft Office), you'll find it better to make a decision and stick with a single product if it can satisfy the needs of your users. They might not like it, and training might be necessary, but supporting multiple applications that do the same thing wastes money and leads to confusion.
  • A commonly overlooked method for getting data files out of a network and onto the Internet is to simply send the files as an attachment to an email. So if you think you've blocked file transfers by disabling FTP access through the firewall, this example should show that you really do need to do a thorough evaluation of any new application or service you will allow on the network. New applications should be justified with facts that show why they are needed. If an existing application can be used to accomplish the same goal, why do you need another application? Should you retire the older application and use a newer one? Pay attention to the details. And don't forget to test new applications to ensure that they perform as expected. The same goes for older applications—will they work on the new or upgraded network?

    Lastly, do you monitor network usage? Do you want to permit users to spend their days browsing the Net, or checking personal email while at work? Many companies have policies that apply to using the telephone for personal business. Do you overlook this situation when giving users email capability? Are you preventing access to sites that are obviously not business-related?

    What Degree of Reliability Do I Require for Each Network Link?

    Just how much downtime is acceptable? For most users, the answer would be zero. Important components of your network, such as file servers, should have fault tolerance built in from the bottom up. In large servers, you'll find dual-redundant power supplies (each connected to a separate UPS), and disk arrays set up using RAID techniques to provide for data integrity in the event that a disk goes south. If a link between two offices needs to be up 100% of the time, you should plan for multiple links between the two sites to provide a backup capability. In this case, you also can justify the cost of the extra link by using load balancing so that network response time is improved. And, if you are using multiple links to remote sites, it's always a good idea to have more than a single path to the site. At one site this author worked at, there were redundant power lines bringing electricity into the site—side-by-side. If a tree falls, will it bring down one or both of those power lines?

    Another technology that can be used to provide an extra layer of redundancy, as well as high-speed access to storage devices, is the Storage Area Network (SAN). A SAN is a network that is separate from the LAN and contains only storage devices and servers that need to access those devices. Because the network bandwidth is not shared with LAN users, multiple servers can access the same storage. If one server fails, other servers can be configured to provide redundant access to the data. Also, the same RAID and other redundancy techniques used for storage devices that are directly attached to a server (such as the SCSI hardware and protocols) can be used on a SAN.

    arrow.jpg

    The terms RAID and UPS are important in today's networks, as is the concept of load balancing and dual-redundant power supplies in large networks. You can find out more about RAID (Redundant Array Of Independent Disks) and UPSs (uninterruptible power supplies) by reading Chapter 5, "Protecting the Network: Preventative Maintenance Techniques." For more information about SANs, see Chapter 11.

    The old saying "If it ain't broke, don't fix it" doesn't apply to networks. You should always be proactively looking for potential single points of failure and doing something to fix them. By building redundancy into the network design at the start, you'll save yourself a lot of grief in the future.

    Chapter 5 can give you more suggestions about using clustering, backups, uninterruptible power supplies, and other techniques that can keep the network up and running.

    Choosing a LAN Protocol

    Today the de facto protocol of choice has to be TCP/IP. However, other protocols have their place in some vertical markets. In this book, we talk about NetWare. NetWare has been around so long that you might find you have no choice when designing an upgrade but to keep using IPX/SPX, depending on the applications your network uses. However, even NetWare has moved toward using TCP/IP as the underlying protocol. This is basically the case for version 5.x and 6.x of NetWare. Older NetWare networks should upgrade, if possible, to one of these newer versions. If you will be connecting the network to the Internet, TCP/IP will be a necessity. Even if you don't expect to have an Internet connection, you'll find that choosing TCP/IP is a more practical choice today because most applications work with it and there is a large market of trained professionals who can be hired to manage a network built on TCP/IP. NetWare 6.x provides backward compatibility with IPX/SPX for the most part, but newer features such as the iPrint—which uses the Internet Printing Protocol—require TCP/IP.

    In addition to transport protocols such as TCP/IP and IPX/SPX, you must consider application protocols that can be used on the network. For example, to simplify administering configuration information for a large number of computers, you might want to use the Dynamic Host Configuration Protocol (DHCP), which is discussed in Chapter 28, "BOOTP and Dynamic Host Configuration Protocol (DHCP)." If you want to provide a central name resolution service, you might choose the Domain Name Service (DNS), which is covered in Chapter 29, "Network Name Resolution." If you are going to operate a Windows network that has pre–Windows 2000/XP clients, you might need to use the Windows Internet Naming Service (WINS) for backward compatibility.

    So when thinking about a network protocol, remember that it's not just one protocol you need to worry about. After you've decided which protocols are necessary, research the security implications of each.

    It's Virtually Universal: TCP/IP

    For all practical purposes, the standard LAN protocol today is TCP/IP. This is partly due to the rapid growth of the Internet, and the necessity of most businesses of having a Web presence, as well as the large number of vendors that have adopted this protocol suite. If your LAN is still using an older proprietary network protocol, you should seriously consider what it would take to upgrade to TCP/IP. Currently, TCP/IP version 4 is the most widely used protocol. In the future you can expect that the next version (IPv6) will start to find its way from the core of the Internet out to the edge, where your network resides. While technologies such as Network Address Translation (NAT) are widely employed to remedy the problem associated with the limited address space provided by IPv4, IPv6 will enable a much larger address space. Combine that with Network Address Translation, and the long-term bets are going to be on IPv6, or possibly some of the features that are part of IPv6. In addition to giving you a larger address space, IPv6 includes other important features. Those that will affect your network the most are security mechanisms, which will only become more important as Internet commerce continues to grow.

    arrow.jpg

    For a detailed introduction to TCP/IP, see Chapter 24, "Overview of the TCP/IP Protocol Suite"; Chapter 25, "Basic TCP/IP Services and Applications"; and Chapter 27, "Troubleshooting Tools for TCP/IP Networks."

    There is one very important reason you should consider TCP/IP as a LAN protocol: There are more trained professionals knowledgeable in TCP/IP than any other LAN protocol at this time. It is interesting to note that in Windows NT 3.51, the default network protocol was Microsoft's implementation of IPX/SPX (NWLink). In Windows NT 4.0 (and successive operating systems, from Windows 2000, XP, and Server 2003), the default network protocol is TCP/IP.

    If your network is composed of several operating systems, from Windows to NetWare to Unix and Linux, then the bottom line is that TCP/IP is the lowest common denominator that will allow the easiest connectivity and interaction between all of these. Even Microsoft's now-legacy NetBIOS/NetBEUI protocols have been adapted to run over TCP/IP.

    Novell's NetWare Version 6.5

    NetWare was perhaps the first attempt at seriously providing a LAN protocol that was easy to use. The basic file and print services offered by early versions of NetWare were much better than other solutions available at that time. After it became established in the business community, NetWare became the network solution of choice in many business environments that used the PC. Microsoft countered this success with its LANManager products, which were also marketed by other vendors in their own way, such as the Pathworks solution from Digital Equipment Corporation.

    Today NetWare is a totally revamped solution to LAN connectivity. It provides many new features that are addressed to specifically make use of the Internet, and allow mobile users to connect to their home networks, as well as to enable NetWare users to make connections to outside networks. For example, the iPrint feature enables NetWare users to print to a printer on a remote network. For example, instead of sending a catalog that may be out of date in a month or so, you can use iPrint to periodically send specific information relevant to each customer, by printing it directly to the customer's printer.

    And NetWare's iFolder allows mobile users to synchronize data stored on remote computers (such as a laptop computer) with the data stored on the company's network. Microsoft and other vendors offer similar features. However, the point to remember is that if you already are a NetWare user, you don't have to throw out your existing investment and move to a Microsoft network, or even a Unix/Linux environment. NetWare has changed as the market has changed, and you might find it less expensive to upgrade to NetWare 6.5 than to migrate to another platform. The bottom line involves not just the cost of migrating to another operating system, but the costs involved with retraining your network administrative personnel in new technology.

    Because NetWare 6.5 is so tightly integrated with the IP protocol, and also offers backward compatibility with IPX/SPX, admins for existing NetWare networks should consider upgrading to NetWare 6.5 as well as considering other options.

    If you want to move to Linux, Novell makes it easy by incorporating an enhanced version of NetWare 6.5 and SuSE Linux into its Novell Open Enterprise Server. Open Enterprise Server supports both Linux and NetWare-specific software and features, enabling you to move to Linux gradually.

    Other LAN/WAN Protocols

    The distinction between LAN and WAN (wide area networking) protocols is beginning to blur. Ethernet was once considered to be a LAN protocol. As time has passed, other technologies, such as Token-Ring, have become minor players in the LAN world. Yet the opposite is true of Ethernet. It has grown from a modest specification endorsed by Intel, DEC, and other vendors, such that it now can be considered a WAN protocol. The capabilities introduced by current LAN technologies are beginning to erode the differences between a LAN and a MAN (metropolitan area network). When the fourth edition of this book was published, Gigabit Ethernet was starting to fall into the inexpensive range of network topologies. That trend has continued and now 10Gigabit Ethernet (10GbE) is frequently being used in enterprise data centers. Today you may be using 100BASE-T for connecting client computers to the network, and Gigabit Ethernet to connect network segments via the network backbone. In some cases your network might even be exclusively based on 10GbE.

    What does this mean to a network administrator today? With 10Gigabit Ethernet, you can use TCP/IP not only to create a local area network backbone, but to extend that reach to a metropolitan area network. And because TCP/IP is so intertwined with Ethernet, you can achieve an end-to-end MAN link that uses TCP/IP over faster Ethernet connections. Instead of employing more expensive solutions, such as SONET, you can now connect branch offices in the same geographical area using just TCP/IP.

    You may not have to worry about installing expensive equipment used by SONET and other typical MAN protocols. Still, for the long haul—for example, between different cities—other protocols such as ATM and Frame Relay will come into play.

    arrow.jpg

    For more information about SONET, ATM, and Frame Relay, see Chapter 15, "Dedicated Connections."



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