單項選擇題

Your company has two servers that run windows server 2008 named server2 and server3, both servers have the DNS server role installed. Server3 is configured to forward all DNS requests to server2. You update a DNS record on server2, you need to ensure that server3 is able to immediately resolve the updated DNS record. What should you do?（）

A.Run the dnscmd /clearcache on server3.
B.Run the ipconfig /flushdns command on server3.
C.Decrease the time-to-live (TTL) on the start of authority (SOA) record of na.contoso.com to 15minutes.
D.Increase the retry interval value on the start of authority (SOA) record of na.contoso.com to 15 minutes.

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單項選擇題

You work as the IT professional in an international company which is named wiikigo. You are experienced in implementing and administering a network operating system. You are specialized in configuring IP addressing and services. Configuring name resolution and network access and so on.Your company is desigiing its network. The network will use an IPv6 prefix of 2001:DB8: BBCC:0000::/53. You have to identify an IPv6 addressing scheme that will support 2000 subnets. Which network mask should you use?（）

A.You should use /63.
B.You should use /64.
C.You should use /61.
D.You should use /62.

單項選擇題

Your network contains an Active Directory domain named contoso.com. The domain contains two domain controllers named DC1 and DC2 that run Windows Server 2008 R2.DC1 hosts a primary zone for contoso.com. DC2 hosts a secondary zone for contosto.com.You need to ensure that DNS zone data is encrypted when the data replicates across the network. DC2 must provide authoritative responses to client computers.What should you do？（）

A.Configure the contoso.com zone to use DNSSEC
B.Create a new delegation in the contoso.com zone
C.Modify the zone transfer settings of the contoso.com zone
D.Convert the contoso.com zone to an Active Directory-integrated zone

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