一台路由器接口信息显示如下:
Serial0/0 current state: UP
Line protocol current state: DOWN
Physical layer is synchronous, Baudrate is 64000 bps
Interface is DCE, Cable type is V35, Clock mode is DCECLK
那么该接口上可能封装或运行了哪种协议?
A.PPP B.HDLC C.Frame Relay D.RIP E.以上答案都不正确正确答案ABCD
