A.P2P B.WEB C.QQlive D.telnet
A.32 B.64 C.128 D.255
A.UDPB.TCPC.PDUD.EIGRP
A.X.25 B.ATM C.IP D.FRAME-RELAY
A.帧中继协议起来 B.电路故障 C.应检查对端电路 D.异常状态
