单项选择题
An administrator is unable to ping a workstation. Which of the following tools would BEST help toresolve the issue?（）
A. Cable tester B. Multimeter C. Toner probe D. Protocol analyzer
多项选择题 Which of the following features would BEST be used to optimize real-time voice and video chat?（）(Select TWO)
单项选择题 1000BaseT has a MAXIMUM run distance of:（）
单项选择题 Which of the following features is essential in a firewall if it is to support RTP sessions?（）
