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Monitoring and Troubleshooting DNS
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Case Scenario Exercise
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You are a network administrator for Trey Research, a company specializing in the development of wind-powered generators and other renewable energy sources. Trey research is based in Monterey, California, and it has a single branch office in Syracuse, New York. After you return from a week-long vacation, you have to face a number of technical issues, including the following: 1. In your unread e-mail, you find an urgent message from the administrator at the Syracuse branch. In the e-mail, the administrator informs you that users at the Syr acuse office cannot reliably resolve computer names in the Monterey office over the virtual private network (VPN) connection. The administrator includes the fol lowing information, which has been copied and pasted from the DNS Events log on the Syracuse DNS server computer, ns5.treyresearch.net.
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A zone transfer request for the secondary zone treyresearch.net was refused by the master DNS server at 192.168.0.15. Check the zone at the master server 192.168.0.15 to verify that zone transfer is enabled to this server. To do so, use the DNS console, and select master server 192.168.0.15 as the applicable server, then in secondary zone treyresearch.net Properties, view the settings on the Zone Transfers tab. Based on the settings you choose, make any configuration adjustments there (or possibly in the Name Servers tab) so that a zone transfer can be made to this server.
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If the DNS server at the Monterey office has been installed by using the Windows Components Wizard, which of the following actions should you perform to enable name resolution for clients at the Syracuse branch Assume that you want to keep or restore the default security settings for zone transfers. a. Configure ns5.treyresearch.net to be notified of zone updates. b. Add an A resource record to the treyresearch.net zone pointing to the com puter ns5.treyresearch.net. c. Configure the treyresearch.net zone to allow zone transfers to any server. d. Add an NS resource record to the treyresearch.net zone pointing to the com puter ns5.treyresearch.net. 2. Sometime after fixing this problem, you decide to create a delegation named syr.treyresearch.net for the Syracuse office. However, you find that users at the Monterey office cannot resolve computer names at the branch office. Using the Nslookup utility to troubleshoot the problem on a Monterey DNS server, ns1.treyresearch.net, you receive the following output:
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C:\>nslookup
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Default Server: ns1.treyresearch.net
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Monitoring and Troubleshooting DNS
Address:
ls treyresearch.net [ns1.treyresearch.net] treyresearch.net. treyresearch.net. treyresearch.net. gc._msdcs ns1 ns5 DomainDnsZones ForestDnsZones syr >
A NS NS A A A A A NS
192.168.0.15
server = ns1.treyresearch.net
server = ns5.treyresearch.net
192.168.0.15
192.168.0.15
192.168.1.2
192.168.0.15
192.168.0.15
server = ns1.treyresearch.net
Exam Tip
Windows Support Tools includes a command-line utility called DNSLint whose main function is to help resolve faulty delegations such as this. DNSLint can also be used to verify DNS records used for Active Directory replication and to search for various record types on multiple DNS servers.
What error is causing the problem in name resolution
3. The syr.treyresearch.net domain is configured as an Active Directory integrated zone at the Syracuse branch office. The zone replication scope has been set to All DNS Servers In The Active Directory Forest. Which partition in Replication Monitor should you use to force replication of the zone data for the syr.treyresearch.net domain a. DC=treyresearch,DC=net b. DC=ForestDnsZones,DC=treyresearch,DC=net c. DC=ForestDnsZones,DC=syr,DC=treyresearch,DC=net d. DC=DomainDnsZones,DC=syr,DC=treyresearch,DC=net
Troubleshooting Lab
In this lab, you troubleshoot a problem related to name resolution. 1. From Computer1, log on to Domain1 as Administrator. Verify that the DNS Man agement console has not been started. 2. Verify that Computer1 is connected to the Internet through the MyISP connection.
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Monitoring and Troubleshooting DNS
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3. From Computer2, log on to Domain1 as Administrator. 4. Verify that you can connect to the Internet on Computer2 by browsing to an exter nal Web site such as http://www.msn.com. You can safely dismiss any warnings you receive about the Web site being blocked by the Microsoft Internet Explorer Enhanced Security Configuration. 5. On Computer2, insert the Supplemental Course Materials CD-ROM. 6. Locate and double-click the following batch file: \70-291\labs\06. The batch file executes. 7. On Computer2, attempt again to connect to the Internet by browsing to a different Web site such as http://www.windowsupdate.com. The attempt is unsuccessful. 8. On Computer 2, open a command prompt and type dnscmd computer1 /clearcache. This command clears the DNS server cache on Computer1.
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