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Whiletroubleshootinganetworkconnectivityproblem,atechnicianobservessteadylinklightsonboththeworkstationNICandtheswitchporttowhichtheworkstationisconnected.However,whenthepingcommandisissuedfromtheworkstation,theoutputmessage"Requesttimedout."isdisplayed.AtwhichlayeroftheOSImodeldoestheproblemmostlikelyexist?（）
A.thesessionlayer
B.theprotocollayer
C.thedatalinklayer
D.theaccesslayer
E.thenetworklayer
F.theapplicationlayer
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