c# qr code generator open source Implementing ISA Server Caching in Visual C#

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Implementing ISA Server Caching
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5. The main office returns the content to the branch-office Web caching server. The branch-office Web caching server places the content in its cache. 6. The branch-office Web caching server returns the content from its cache to the requesting user.
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Cache File Cached Web Object 1 Cached Web Object 2 Cached Web Object 3 ISA Server Corporate Head Office 3 4 5 2 ISA Server 1 6 Branch Office Network
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Figure 6-3 Web chaining and caching for branch offices
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One of the common deployment scenarios for ISA Server in organizations with multiple locations is the Web chaining and caching scenario. Often the branch offices are connected to central offices using fairly slow wide area network (WAN) connections. By deploying an ISA Server in each branch office and enabling caching on the server, these organizations can reduce the use of the WAN bandwidth. You have several options when deploying this configuration. One option is to deploy the ISA Server computer with a single network interface. If you already have a router at the branch office, and you don t require ISA Server to filter network traffic, you can configure the ISA Server computer with a single network interface and then configure all the clients in the branch offices to use the ISA Server computer as a proxy server. You can also take advantage of content download jobs in this scenario. If you have an Intranet Web site to which all users need access, you can download the content to the local ISA Server overnight. If you are deploying ISA Server Enterprise Edition, you can also configure an array of multiple ISA Server computers at the head office and use CARP to ensure that as much content as possible is cached.
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Lesson 1
Caching Overview
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Lesson Review
Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you have difficulty answering these questions, review the material in this lesson before beginning the next lesson. You can find answers to these questions in the Questions and Answers section at the end of this chapter. 1. You have deployed ISA Server 20004 in a large office with a relatively slow Internet connection. The ISA Server computer is to be used only for caching content. What can you do to maximize cache response time
2. You have deployed ISA Server 2004 and configured the server as a Web proxy server. All internal client computers are configured as Web proxy clients. You have limited bandwidth to the Internet, so you enable caching on ISA Server, using the default caching configuration. Many users in your organization, you notice, access a partner organization s Web site several times a day. The Web site contains many large files that are changed every few days; when users download the files, much of the available bandwidth to the Internet is used. You need to make sure that users have access to the partner Web site, yet you must limit the amount of bandwidth used to access the Web site as much as possible during working hours. What should you do a. Install the Firewall client on each client computer. b. Configure caching to cache only small files from the partner Web site. c. Configure a content download job to download the partner Web site every night. d. Configure the ISA Server to cache content with a TTL of one day. 3. Users in your organization must download files from an FTP site on the Internet twice a day. Your users report that they frequently download outdated versions of the file. What is happening and how will you fix it
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Implementing ISA Server Caching
Lesson Summary
ISA Server 2004 uses caching to retrieve and store cacheable Web content so that the next time a client requests the same content it can be retrieved from the cache file to provide faster response and reduce bandwidth consumption. Forward caching stores Web content from the Internet for internal clients. Reverse caching stores Web content from an internal published Web site for Internet clients. Content download jobs allow you to retrieve in advance Web content based on your analysis of usage. Jobs can be scheduled to run at off-peak hours to populate the ISA Server cache content prior to a user s requesting the data. When caching is enabled on ISA Server, it stores the cache both in the server memory and on the server hard disk. ISA Server optimizes the use of the cache. Web proxy chaining can allow branch offices to take advantage of a larger cache maintained at head office and use it to build up cached content at the branch office.
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