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Configuring Web Caching (4.0)
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E. Correct: Given that the Web pages have a TTL of 90 minutes and that they were last accessed at 13:10 CST, the Web pages in the ISA Server 2004 cache will expire at 14:40 CST. However the settings indicate that the object will be returned after it has expired for a period of up to 60 percent of the original TTL unless that period exceeds 80 minutes. In this case, 60 percent of the original TTL of 90 minutes is 54 minutes, meaning that the object will be returned up to 144 minutes after it was originally cached if the Web site that hosted the object cannot be contacted. Because the objects entered the cache at 13:10 CST, they will be returned from the cache, assuming that the Web server is unavailable, until 15:34 CST.
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Objective 4.3
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Diagnose and Resolve Caching Issues 16-21
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Diagnose and Resolve Caching Issues
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Once a cache is functional, it is important to monitor it to see whether there is any way that you can improve performance by tuning the ISA Server 2004 computer. The performance monitor contains a range of ISA Server Cache performance objects that can be useful in monitoring the function of the cache. Reports generated in the Monitoring node of the ISA Server 2004 Management Console also can provide more general information about how effectively the cache is being used. Given this information, you may consider altering the way in which active caching or the advanced cache settings are configured.
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Configuring Web Caching (4.0)
Objective 4.3 Questions 1.
You want to get an idea of the number of Uniform Resource Locators (URLs) kept in the ISA Server 2004 cache at any one time as a way of base-lining cache performance. Which of the following methods should you use (Choose the best answer.) A. Generate a report using the default report settings. B. Add the Total URLs Cached counter to Performance Monitor. C. Add the Total URLs Retrieved From Disk counter to Performance Monitor D. Add the URL Commit Rate counter to Performance Monitor.
You are the security administrator at Contoso Ltd., which has an ISA Server 2004 computer with the 3-Leg Perimeter network template applied. On the perimeter network is Contoso s World Wide Web server, www.contoso.com. This server is updated regularly with important information that should be disseminated to Contoso investors and is published through the ISA Server 2004 computer. Since enabling Web caching last week, you have had complaints from investors connecting from the Internet that they are not being given the most recently updated information. On the other hand, since instituting caching, usage of the Contoso Internet link has dropped considerably and your manager projects that this will save the company several thousand dollars this quarter. What can you do to retain the savings realized by instituting caching while also ensuring that investors are not receiving outdated information when they connect to www.contoso.com from hosts on the Internet (Choose the best answer.) A. Set the size of the Web cache on the ISA Server 2004 computer to zero. B. Disable reverse caching. C. Create a cache rule that disables caching for http://www.contoso.com/* URLs. D. Increase the TTL on pages located on the www.contoso.com Web server.
Objective 4.3
Diagnose and Resolve Caching Issues 16-23
Users on your network have noticed a great difference between accessing normal Web sites and accessing Secure Sockets Layer (SSL) Web sites on the Internet. After some analysis, you determine that performance for normal Web sites is good because the content is being cached. The performance for SSL Web sites, on the other hand, is bad because the content must be retrieved from the Internet each time. You examine the traffic carefully and notice that 95 percent of the SSL traffic is bridged, rather than tunneled. Besides the default, there is a single cache rule configured named Cacherule. Which of the following steps will increase the speed of 95 percent of the SSL traffic for users on your internal network (Choose the correct answer.) A. Install a stand-alone certificate authority (CA) on the ISA Server 2004 computer. B. This cannot be done. C. Edit the Cacherule cache rule. Ensure that Cache SSL Responses is selected. D. Set the size of the cache to zero on the ISA Server 2004 computer.
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