A.呼叫鏈路識別 B.PAP C.CHAP D.RADIUS
A.190.5.4.0 190.5.7.255 B.190.5.4.0 255.255.255.255 C.190.5.0.0 190.5.4.255 D.190.5.4.0 190.5.4.255
A.IP B.IPX C.IGRP D.NETBEUI