单项选择题 An administrator is deploying three B/G wireless access points in a new office location. Which ofthe following channels eliminates interference?（）

单项选择题 Which of the following allows a technician to mask a private network of IP addresses behind onepublic IP address?（）

单项选择题 An administrator finds a phone line but does not know where the line goes or if it is active. Whichof the following can be used to test if it is active?（）