单项选择题
A.Link Control Protocol（LCP） is used for basic PPP link setup and operation
B.Link Control Protocol（LCP） is used for denying PPP connections to unauthorized devices.
C.Link Control Protocol（LCP） for PPP is synonymous to ARP for Ethernet.
D.None of the above
单项选择题 WhatCiscoIOSfeatureexaminespacketsreceivedtomakesurethatthesourceaddressandinterfaceareintheroutingtableandmatcktheinterfacethatthepacketwasreceivedon？（）
单项选择题 InwhichstatecanBGPpeersexchangeUpdatemessages？（）
单项选择题 InPIM-SMoperations，thefirstrouterconnectedtothemulticastsourcesendstheRegistermessagetowhichdevice？（）