YouenabledCDPontwoCiscoRouterswhichareconnectedtoeachother.TheLineandProtocolstatusfortheinterfacesonbothroutersshowasUPbuttheroutersdonotseeeachotheraCDPneighbors.WhichlayeroftheOSImodeldoestheproblemmostlikelyexist？（）A.PhysicalB.SessionC.ApplicationD.Da
题目
YouenabledCDPontwoCiscoRouterswhichareconnectedtoeachother.TheLineandProtocolstatusfortheinterfacesonbothroutersshowasUPbuttheroutersdonotseeeachotheraCDPneighbors.WhichlayeroftheOSImodeldoestheproblemmostlikelyexist？（）
A.Physical
B.Session
C.Application
D.Data-Link
E.Network