单项选择题
Which WAN protocol is used for out-of-band signaling?（）
A.NCP B.HDLC C.LAPB D.LAPD
单项选择题 Inverse ARP is being used in the TestKing frame relay network. What is the purpose of Inverse ARP?（）
多项选择题 WAN data link encapsulation types include which of the following?（）
多项选择题 Which of the following commands would be applied to a WAN interface, but not on LAN Interface?（）
