题目内容（请给出正确答案）

[单选题]

AtwhichlayeroftheOSImodeldoestheSpanningTreeProtocol（STP）operateat？（）

A.Layer5

B.Layer4

C.Layer3

D.Layer2

E.Layer1

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更多“AtwhichlayeroftheOSImodeldoest…”相关的问题

第1题

Which statement correctly describes a situation in which VRFs are used in the data center?（）

A. Partitioning of network resources is enabled.

B. VRFs cannot support path isolation from MAN/WAN designs.

C. VRFs cannot be used to map a virtualized data center to a MPLS implementation.

D. VRFs do not allow for the use of application services with multiple access topologies.

E. An access design using a VRF allows for an aggregation layer service module solution.

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第2题

Which IOS command would you use to find out which networks are routed by a particular OSPF process（）

A.show ip ospf

B.show ip route

C.show ip protocols

D.show ip ospf database

E.None of the other alternatives apply

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第3题

WhichthreestatementsaretrueabouttheapplicationofQoSmodels？（）

A.TheDiffServmodelrequiresapplicationstosignalthenetworkwithQoSrequirements.

B.TheDiffServmodelcanbeusedtodeliverQoSbaseduponIPprecedence，orsourceanddestinationaddresses.

C.TheDiffServmodelrequiresRSVP.

D.Thebesteffortmodelissuitableforapplicationssuchasfiletransferande-mail

E.TheIntServmodelrequiresapplicationstosignalthenetworkwithQoSrequirements.

F.TheIntServmodelattemptstodeliveralevelofservicebasedontheQoSspecifiedbyeachpacket

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第4题

Incomputernetworkingamulticastaddressisanidentifierforagroupofhoststhathavejoinedamulticas

tgroup.MulticastaddressingcanbeusedintheLinkLayer（OSILayer2），suchas EthernetMulticast，aswellasattheInternetLayer（OSILayer3）asIPv4orIPv6Multicast.Whichtwodescriptionsarecorrectregardingmulticastaddressing？（）

A.Thefirst23bitsofthemulticastMACaddressare0x01-00-5E.Thisisareservedvaluethatindicatesamulticastapplication

B.Thelast3bytes（24bits）ofthemulticastMACaddressare0x01-00-5E.Thisisareservedvaluethatindicatesamulticastapplication

C.TocalculatetheLayer2multicastaddress，thehostmapsthelast23bitsoftheIPaddressintothelast24bitsoftheMACaddress.Thehigh-orderbitissetto0

D.Thefirst3bytes（24bits）ofthemulticastMACaddressare0x01-00-5E.Thisisareservedvaluethatindicatesamulticastapplication

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第5题

WhatarethreeconsiderationswhenchoosingtheQoSmodeltodeployinanetwork？（）

A.theroutingprotocolsbeingutilizedinthenetwork

B.theapplicationsutilizingthenetwork

C.thetrafficdestinations

D.networkaddressingscheme

E.costofimplementation

F.theamountofthecontrolneededoftheresources

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第6题

Which statement about data center access layer design modes is correct?（）

A. The access layer is the first oversubscription point in a data center design.

B. When using a Layer 2 loop-free design, VLANs are extended into the aggregation layer.

C. When using a Layer 2 looped design, VLANs are not extended into the aggregation layer.

D. When using a Layer 3 design,stateful services requiring Layer 2 connectivity are provisioned from the aggregation layer.

E. The data center access layer provides the physical-level connections to the server resources and only operates at Layer 3.

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第7题

WhataretwostepsneededtodefineaQoSpolicyforatrafficclass？（）

A.Determineaminimumbandwidthguarantee.

B.Determineinterfacestowhichtoapplypolicy.

C.Assignprioritiestotheclass.

D.Configureaccesscontrollists.

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第8题

EIGRPisbeingusedastheroutingprotocolonthecompanynetwork.Whiletroubleshootingsomenetworkconnectivityissues，younoticealargenumberofEIGRPSIA（StuckinActive）messages.WhatcausestheseSIAroutes？（）

A.TheneighboringrouterstopsreceivingACKpacketsfromthisrouter

B.Theneighboringrouterstartsreceivingrouteupdatesfromthisrouter

C.Theneighboringrouteristoobusytoanswerthequery（generallycausedbyhighCPUutilization）

D.Theneighboringrouterishavingmemoryproblemsandcannotallocatethememorytoprocessthequeryorbuildthereplypacket

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第9题

Whenarouterconvertsanalogsignalstodigitalsignals，whatthreestepsarealwaysincludedintheprocess？（）

A.involution

B.encoding

C.sampling

D.quantization

E.compression