单项选择题
A. Restart the DNS Server service on DC1
B. Run the dnscmd command by using the /zonerefresh option on DC1
C. Run the dnscmd command by using the /zonerefresh option on SRV1
D. Set the refresh interval to 10minutes on the Start Of Authority （SOA） record.
单项选择题 Your company has a single Active Directory domain.The domain has servers that run Windows Server 2008 R2. You have a server named NAT1 that functions as a NAT server.You need to ensure that administrators can access a server named RDP1 by using Remote Desktop Protocol (RDP).What should you do？（）
单项选择题 Yourcompanyhasamainofficeandtwobranchoffices.DomaincontrollersinthemainofficehostanActiveDirectory-integratedzone.TheDNSserversinthebranchofficehostasecondaryzoneforthedomainandusethemainofficeDNSserversastheirDNSmasterserversforthezone.Thecompanyaddsanewbranchoffice.YouaddamemberservernamedBranch3andinstalltheDNSserviceontheserver.Youconfigureasecondaryzoneforthedomain.Thezonetransferfails.YouneedtoconfigureDNStoprovidezonedatatotheDNSserverinthenewbranchoffice.Whatshouldyoudo？（）
单项选择题 Your company has a single Active Directory domain. The company network is protected by a firewall.Remote users connect to your network through a VPN server by using PPTP.When the users try to connect to the VPN server, they receive the following error message :Error 721:The remote computer is not responding.You need to ensure that users can establish a VPN connection.What should you do？（）