单项选择题
Your network contains a DNS server named DNS1 that runs Windows Server 2008 R2. DNS1 hosts a zone named contoso.com.Dynamic updates are enabled on the zone.The network contains a server named Web1.contoso.com.All computers on the network are configured to use DNS1 as their DNS server.You need to ensure that users can connect to Web1.contoso.com by using the name portal.contoso.com.The solution must ensure that the users can connect by using portal. contoso.com if the IP address of Web1.contoso.com changes.Which type of resource record should you create？（）
A. Alias (CNAME)
B. Host (A)
C. Host Information (HINFO)
D. Pointer (PTR)
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单项选择题
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. -
单项选择题
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. -
单项选择题
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
