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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

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QUESTION 31
You have a DHCP server that runs Windows Server 2008 R2. You restore the DHCP database by using a recent backup. You need to prevent DHCP clients from receiving IP addresses that are currently in use on the network. What should you do?

A.    Add the DHCP server option 15.
B.    Add the DHCP server option 44.
C.    Set the Conflict Detection value to 0.
D.    Set the Conflict Detection value to 2.