单项选择题 You have a computer that runs Windows Vista. You run ipconfig /release from the command prompt and receive the following error message: “The requested operation requires elevation.” You need to release the IP address for the computer. What should you do?（）

单项选择题 You are able to access a Web server from your computer by using the IP address of the Web server. You fail to access the Web server when you use its fully qualified domain name. Other users on your network can access the Web server by using both the IP address and the fully qualified domain name. You need to access the Web server by using the fully qualified domain name. What should you do?（）

单项选择题 Your computer is unable to access external names or IP addresses. You need to connect to external Internet resources. What should you do first?（）