单项选择题
A.A BGP router can only advertise an EBGP learned route，provided that the route is an IGP route in the routing table.
B.A BGP router can only advertise an IBGP learned route，provided that the route is an IGP route in the routing table.
C.A BGP router can only advertise an IBGP learned route，provided that the route is an IGP route that is not in the routing table.
D.A BGP router can only advertise an EBGP learned route，provided that the route is a metric of 0 in the BGP table.
单项选择题 YouhavearouterrunningBGPfortheMPLSnetworkandOSPFforthelocalLANnetworkatthesalesoffice.ArouteisbeinglearnedfromtheMPLSnetworkthatalsoexistsontheOSPFlocalnetwork.ItisimportantthattherouterchoosesthelocalLANroutebeinglearnedfromthedownstreamswitchrunningOSPFratherthantheupstreamBGPneighbor.Also，ifthelocalOSPFroutegoesaway，theBGProuteneedstobeused.WhatshouldbeconfiguredtomakesurethattherouterwillchoosetheLANnetworkasthepreferredpath？（）
单项选择题 WhichRMONgroupstoresstatisticsforconversationsbetweensetsoftwoaddresses？（）
问答题 DHCP的防止欺骗的机制是什么？