TworoutersconfiguredtorunBGPhavebeenconnectedtoafirewall,oneontheinsideinterfaceandoneonth

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TworoutersconfiguredtorunBGPhavebeenconnectedtoafirewall，oneontheinsideinterfaceandoneontheoutsideinterface.BGPhasbeenconfiguredsothetworoutersshouldpeer，includingthecorrectBGPsessionendpointaddressesandthecorrectBGPsessionhop-countlimit（EBGPmultihop）.WhatisagoodfirsttesttoseeifBGPwillworkacrossthefirewall？（）

A.AttempttoTELNETfromtherouterconnectedtotheinsideofthefirewalltotherouterconnectedtotheoutsideofthefirewall.Iftelnetworks，BGPwillwork，sincetelnetandBGP bothuseTCPtotransportdata.

B.Pingfromtherouterconnectedtotheinsideinterfaceofthefirewalltotherouterconnectedtotheoutsideinterfaceofthefirewall.Ifyoucanpingbetweenthem，BGPshouldwork，sinceBGPusesIPtotransportpackets.

C.ThereisnowaytomakeBGPworkacrossafirewallwithoutspecialconfiguration，sothereisnosimpletestthatwillshowyouifBGPwillworkornot，otherthantryingtostartthepeeringsession.

D.ThereisnowaytomakeBGPworkacrossafirewall.

参考答案:

参考A

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