单项选择题
You are the network administrator of an enterprise company that just deployed a global IP telephonyenvironment. In order to guarantee good voice quality，you asked your provider to implement QoS on the CE routers of your MPLS network. On your LAN，you have also deployed QoS.Users，however，keep complaining about bad voice quality，and the provider does not see matches on the DSCP values that you have asked him to match upon. What is most likely the problem？（）
A.The phones are not sending traffic with the correct DSCP value.
B.The Cisco CallManager is not marking the traffic correctly.
C.This is most likely a bug on the CE routers.
D.Your LAN QoS is incorrectly configured.
相关考题
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单项选择题
YouarethenetworkadministratorofaLayer3switchednetwork.UsersinoneVLANarecomplainingthataccesstotheserverVLANisveryslowfromtimetotime.TrafficinthelocalVLANworkswithoutanyissue，andusersinotherVLANsdonothaveanycomplainttoreachtheserverVLAN.Whatismostlikelythecauseofthisissue？（）
A.routing issue
B.denial-of-service attack
C.MAC flooding
D.spanning-tree recalculation
E.Layer 2 loop
F.ARP spoofing attack -
单项选择题
Youaredeployingtwocoreswitches，oneineachbuilding，50kmawayfromeachother.Thecross-connectionbetweenthemwillbeaLayer22-gigabitEtherChannelwithan802.1Qtrunk.Youconfigureditcorrectlybutthelinkdoesnotcomeup.Theportisinthe"adminup"state，andthelineprotocolisinthe"down"state.ThefiberlinkisOK.Whatwouldbethemostlikelyreasonforthelinknottocomeup？（）
A. The switches are not the same model
B. You are not using the correct SFP
C. You are not using correct optical media converters
D. Configuration should be modified， because the distance is longer -
多项选择题
YourcompanyisresearchinganewapplicationthatrunsoverIPv6，butpartofitmuststillhaveIPv4support.YourcompanyusesatraditionalIPv4network.YourplanisnottorunIPv6overthewholenetwork，buttosegmentpartsofthenetworkoreventooperatesimultaneouslywithIPv6andIPv4.YoumustmakeabriefpresentationaboutIPv6technologytotheboardoftechnicaldirectors.Whichthreeoftheseitemscouldbepartofyourpresentation？（）
A. Tunnel IPv6 over IPv4 to connect far-end IPv6 networks
B. Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is not possible
C. Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is possible
D. What is the meaning of EUI-64 and how does it work？
E. Tunnel IPv4 over IPv6 to connect far-end IPv4 networks.
