单项选择题 your company has a single active directory forest that has a domain in North America named na.contoso.com and a domain in south America named sa.contoso.com. The client computers run windows vista. You need to configure the client computes in north America office to improve the name resolution response time for resources in the south ameirca offica. What should you do?（）

单项选择题 Your network contains a server named Server1.contoso.com. Server1 is located on the internal network. You have a client computer named Computer1 that runs Windows 7. Computer1 is located on a public network that is connected to the Internet. Computer1 is enabled for DirectAccess. You need to verify whether Computer1 can resolve Server1 by using DirectAccess. Which command should you run on Computer1？（）

单项选择题 our company has computers in multiple locations that use IPv4 and IPv6. Each location is protected by a firewall that performs symmetric NAT. You need to allow peer-to-peer communication between all locations. What should you do?（）