单项选择题
A. Circuit switching
B. Network address translation
C. Power over Ethernet
D. Virtual servers
单项选择题 When each routing device has a consistent view of the network topology, the network is said to be:（）
单项选择题 Which of the following would MOST likely be used with multimode fiber?（）
单项选择题 A company has recently received a new ADSL backup Internet connection. Which of the followingwill MOST likely be used between the modem and the ISP?（）