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Most of the company s computing services are hosted in the corporate HQ in Paris. The corporate IT department wants to have central control of passwords and security set tings. The local IT department at the Los Angeles office wants to maintain control of its infrastructure without the interference from the corporate IT department. The local IT department at the Glasgow office demands that they have exclusive control over their own environment due to security concerns of their research and development data. Corporate management shares the security concern over the R&D data and wants to ensure that this data is not compromised. The following illustration shows the connectivity between the different locations of the company. In addition, Los Angeles and Atlanta have virtual private network (VPN) connec tions through the Internet to the headquarters in Paris. The table following the network diagram summarizes the rest of the connectivity information about Northwind Traders.

The local resolver cache can include name information obtained from two possible sources:

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If a Hosts file is configured locally, any host-name-to-address mappings from that file are loaded into the cache when the DNS Client service is started and after the Hosts file is updated. Resource records obtained in answered responses from previous DNS queries are added to the cache and kept for a period of time.

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If the query does not match an entry in the cache, the resolution process continues with the client querying a DNS server to resolve the name. Part 2: Querying a DNS Server The DNS Client service uses a server search list ordered by preference. This list includes all preferred and alternate DNS servers configured for each of the active network connections on the system. The client first que ries the DNS server specified as the preferred DNS server in the connection s Internet Protocol (TCP/IP) Properties dialog box. If no preferred DNS servers are available, alternate DNS servers are used. Figure 4-2 shows a sample list of preferred and alter nate DNS servers, as configured in Windows Server 2003.

For computers running operating systems that do not support Group Policy, such as Windows NT, Windows ME, Windows 98, and Windows 95, the only way to assign a logon script is to add the filename to the Logon Script text box on the Profile tab of a user s Properties sheet in Active Directory Users And Computers or Local Users And Groups, as shown in Figure 4-19.

Based on the scenario, answer the following questions. 1. Draw a site map for Northwind Traders, including all site links that you will create. Indicate the cost that you will assign to each site link. In addition, specify the schedule information for site links that will not use the default schedule.

When a DNS server receives a query, it first checks to see whether it can answer the query authoritatively that is, on the basis of information contained in a locally config ured zone on the server. If the queried name matches a corresponding resource record in local zone information, the server answers authoritatively, using this information to resolve the queried name.

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The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. What characteristics of WAN links would indicate that they should share a com mon site link

If no zone information exists for the queried name, the server then checks to see whether it can resolve the name by using locally cached information from previous queries. If a match is found here, the server answers with this information. Again, if the preferred server can answer with a positive matched response from its cache to the requesting client, the query is completed.

If the queried name does not find a matched answer at its preferred server either from its cache or zone information the query process continues in a manner depen dent on the DNS server configuration. In the default configuration, the DNS server performs recursion to resolve the name. In general, recursion in DNS refers to the process of a DNS server querying other DNS servers on behalf of an original querying client. This process, in effect, turns the original DNS server into a DNS client. If recursion is disabled on the DNS server, the client performs iterative queries by using root hint referrals from the DNS server. Iteration refers to the process of a DNS client making repeated queries to different DNS servers.

To complete this chapter, make sure you are familiar with the concepts described in 1, Introduction to Active Directory and Network Infrastructure.

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