单项选择题 TworoutersconfiguredtorunBGPhavebeenconnectedtoafirewall，oneontheinsideinterfaceandoneontheoutsideinterface.BGPhasbeenconfiguredsothetworoutersshouldpeer，includingthecorrectBGPsessionendpointaddressesandthecorrectBGPsessionhop-countlimit（EBGPmultihop）.WhatisagoodfirsttesttoseeifBGPwillworkacrossthefirewall？（）
单项选择题 WhichstatementcorrectlydescribesthedisablingofIPTTLpropagationinanMPLSnetwork？（）
单项选择题 WhichoftheseismandatorywhenconfiguringCiscoIOSFirewall？（）