CCIE+CK题库钻石终结版

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1、1、WhatisBGPsynchronization?A:Theruleofsynchronizationstatesthefollowing:BeforearoutelearnedfromanIBGPneighborisenteredintotheIProutingtableorisadvertisedtoaBGPpeer,theroutemustfirstbeknownviaIGP.2、whichBGPattributeswillinfluenceinboundflow?A:MED、AS-PATH，ORIGIN3

2、、BGPAdministrativedistanceA：BGPhasadistancebgpcommandthatallowsyoutosetdifferentadministrativedistancesforthreeroutetypes:external,internal,andlocal.Externalroute20Internalroute200Localroute2004、WhichpictureisTrafficShape,why?A:Policingtypicallydropsexcesstraff

3、ic.Shapingsmoothtraffictoaspecificrateusingabuffer.5、Unequalcostload-sharingA:RouterEwillselectbothBandCasnexthoptoreachnetworkZ.Unequalcostloadsharinghappening.Thevariancecommandisusedtodeterminewhichroutesarefeasibleforunequal-costloadsharing.Variancedefinesa

4、multiplierbywhichametricmaydiffer,orvary,fromthemetricofthelowest-costroute.Anyroutewhosemetricexceedsthemetricofthelowest-costroute,multipliedbythevariance,willnotbeconsideredafeasibleroute.Thedefaultvarianceisone,meaningthatthemetricsofmultipleroutesmustbeequ

5、al,toloadbalance.Variancemustbespecifiedinwholenumbers.Thefollowingthreeconditionsmustbemetforaroutetobeincludedinunequal-costloadsharing:·Themaximum-pathslimitmustnotbeexceededasaresultofaddingtheroutetoaload-sharinggroup.·Thenext-hoproutermustbemetricallyclos

6、ertothedestination.Thatis,itsmetricfortheroutemustbesmallerthanthelocalrouter'smetric.Anext-hoprouter,beingclosertothedestination,isoftenreferredtoasthedownstreamrouter.(加入负载均衡的下一跳的路由器必须要满足FC，即AD

7、ricofthelowest-costroutemultipliedbythevariance,mustbegreaterthanthemetricoftheroutetobeadded.EIGRP基本概念：（1）adjacency：Anadjacencyisalogicalassociationbetweentwoneighborsoverwhichrouteinformationisexchanged.Whenadjacencieshavebeenestablished,therouterwillreceiveu

8、pdatesfromitsneighbors.（2）feasibledistance(FD)：Thelowestcalculatedmetrictoeachdestinationwillbecomethefeasibledistance(FD)ofthatdestination.（3）feasibilitycondition(FC)：Thefe