单项选择题
A.Straight B.Console C.Crossover D.Loopback
Which of the following would MOST likely be used to pun...
单项选择题Which of the following would MOST likely be used to punch down LAN cables before connecting them to the main switch?（）
A. IDF B. 66 block C. MDF D. 110 block
In which of the following layers of the OSI model does ...
单项选择题In which of the following layers of the OSI model does the TCP protocol operate?（）
A.Session B.Network C.Data link D.Transport
Which of the following ports does POP3 services use, by...
单项选择题Which of the following ports does POP3 services use, by default?（）
A.25 B.110 C.143 D.443
