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QUESTION 321
Your network contains a DNS zone for contoso.com. All servers register their host names in DNS by using dynamic updates. The network contains a server named Server1.contoso.com. From a computer named Computer1 that runs Windows 7, you successfully resolve Server1.contoso.com to an IP address. You change the IP address of Server1.contoso.com. From Computer1, you discover that server1.contoso.com still resolves to the old IP address. You successfully connect to server1.contoso.com by using the new IP address. You need to ensure that you can immediately resolve Server1.contoso.com to the new IP address. What should you do on Computer1?

A.    Run ipconfig.exe and specify the /flushdns parameter.
B.    Run netsh.exe and specify the dnsclient context.
C.    Restart the Peer Name Resolution Protocol (PNRP) service.
D.    Run dnscacheugc.exe.

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QUESTION 51
Your company has a single Active Directory domain named contoso.com. All servers run Windows Server 2008. You have a public DNS server named Server1, and an e-mail server named Server2. Client computers outside the company domain are unable to send e-mail messages to contoso.com You verify that the host (A) DNS record for Server2 is availible to external client computers. You need to ensure Server2 can receive e-mail messages from external client computers. How should you configure the contoso.com DNS zone?

A.    Add a Mail Exchange (MX) record for Server2
B.    Add a Mailbox (MB) record for Server2. Set the Mailbox Host setting to Server2
C.    Add a Canonical (CNAME) record that maps Server2 to contoso.com
D.    Add a Service Locator (SRV) record for Server2. Set the Service field to _smtp. Set the Protocol field to _tcp. Set the Port Number to 25