A.加密算法 B.散列算法 C.驗證方法 D.共享密鑰
A.SCCRQ(Session-Control-Connecting-Request) B.SCCRP(Session-Control-Connecting-Reply) C.ICRQ(Incoming-Call-Request) D.ICRP(Incoming-Call-Reply)
A.私有IP→PPP→UDP→L2TP→公有IP B.私有IP→L2TP→PPP→UDP→公有IP C.私有IP→L2TP→UDP→PPP→公有IP D.私有IP→PPP→L2TP→UDP→公有IP