单项选择题
A.CEF
B.FIB
C.LFIB
D.IGP
单项选择题 panningTreeProtocolcalculatespathcostbasedonwhichofthese？（）
单项选择题 Anexpandingcompanyisdeployingleasedlinesbetweenitsmainsiteandtworemotesites.Thebandwidthoftheleasedlinesis128kb/seach，terminatedondifferentserialinterfacesonthemainrouter.TheselinksareusedforcombinedVOIPanddatatraffic.ThenetworkadministratorhasimplementedaVOIPsolutiontoreducecosts，andhasthereforereservedsufficientbandwidthinalowlatencyqueueoneachinterfacefortheVOIPtraffic.Usersnowcomplainaboutbadvoicequalityalthoughnodropsareobservedinthelowlatencyqueue.Whatactionwilllikelyfixthisproblem？（）
多项选择题 WhichtwooftheseareusedintheselectionofarootbridgeinanetworkutilizingSpanningTreeProtocolIEEE802.1D？（）