单项选择题 AnetworkiscomposedofseveralVRFs.ItisrequiredthatVRFusersVRF_AandVRF_BbeabletoroutetoandfromVRF_C，whichhostssharedservices.However，trafficmustnotbeallowedtoflowbetweenVRF_AandVRF_B.Howcanthisbeaccomplished？（）
问答题 whatisLFI？
问答题 youwanttoviewthestatusofaframerelayconnection.HowtodisplaythestatusofaFrame-RelayPVC？