单项选择题
Which device enables a router serial interface to connect to the ISDN BRI?（）
A.NT2 B.NT1 C.TE D.TA E.TE1
多项选择题 What functions do routers perform in a network?（）
单项选择题 If NVRAM lacks boot system commands, where does the router look for the Cisco IOS by default?（）
多项选择题 When selecting a Network Interface Card (NIC), which of the following factors need to be considered?（）
