单项选择题
A.BGP peers must be Layer 2-adjacent.
B.EBGP multihop is not configured.
C.The firewall is not configured to allow IP protocol 89.
D.The firewall is not configured to allow UDP 179.
单项选择题 AnetworkiscomposedofseveralVRFs.ItisrequiredthatVRFusersVRF_AandVRF_BbeabletoroutetoandfromVRF_C，whichhostssharedservices.However，trafficmustnotbeallowedtoflowbetweenVRF_AandVRF_B.Howcanthisbeaccomplished？（）
单项选择题 WhichofthesetablesisusedbyanLSRtoperformaforwardinglookupforapacketdestinedto anaddresswithinanRFC4364VPN？（）
单项选择题 panningTreeProtocolcalculatespathcostbasedonwhichofthese？（）