单项选择题 A client is having problems connecting remotely after replacing a router. An administrator has just created an action plan. Which of the following is the NEXT step the administrator should perform to resolve this issue?（）

单项选择题 For security reasons a network technician wants to install a Linux based email server, Microsoft web services, and directory services on different servers. Which of the following technologies would be BEST to reduce hard ware costs?（）

单项选择题 An administrator is troubleshooting wireless connectivity issues at a client’s office and discoversthat the machine loses connectivity when the wireless phone is being used. Which of the following WAPS should be installed to help resolve the issue?（）