TworoutersconfiguredtorunBGPhavebeenconnectedtoafirewall,oneontheinsideinterface
TworoutersconfiguredtorunBGPhavebeenconnectedtoafirewall，oneontheinsideinterfaceandoneontheoutsideinterface.BGPhasbeenconfiguredsothetworoutersshouldpeer，includingthecorrectBGPsessionendpointaddressesandthecorrectBGPsessionhop-countlimit（EBGPmultihop）.WhatisagoodfirsttesttoseeifBGPwillworkacrossthefirewall？（）
A.AttempttoTELNETfromtherouterconnectedtotheinsideofthefirewalltotherouterconnectedtotheoutsideofthefirewall.Iftelnetworks，BGPwillwork，sincetelnetandBGP bothuseTCPtotransportdata.
B.Pingfromtherouterconnectedtotheinsideinterfaceofthefirewalltotherouterconnectedtotheoutsideinterfaceofthefirewall.Ifyoucanpingbetweenthem，BGPshouldwork，sinceBGPusesIPtotransportpackets.
C.ThereisnowaytomakeBGPworkacrossafirewallwithoutspecialconfiguration，sothereisnosimpletestthatwillshowyouifBGPwillworkornot，otherthantryingtostartthepeeringsession.
D.ThereisnowaytomakeBGPworkacrossafirewall.
正确答案：参考A
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