单项选择题 Your company has a domain with multiple sites.You have a domain-based DFS namespace called \\contoso.com\management namespace hierachy is updated frequently. You need to configure the \\contoso.com\management namespace to reduce the workload of the PDC emulator. What should you do?（）

单项选择题 You have a server that runs windows server 2008. You need to prevent the server from establishing communication sessions to other computers by using TCP port 25. What should you do?（）

单项选择题 Your company has an active directory forest that has five domains. All DNS servers are domain controllers. You need to ensure that users from all domains are able to access a web server named App1 by browsing http://App1. What should you do?（）