All of these are fundamental building blocks of differentiated services Traffic Conditioner Block exceptwhich one？（）

单项选择题Youarethenetworkadministratorofanenterprisewithamainsiteandmultipleremotesites.YournetworkcarriesbothVOIPanddatatraffic.YouagreewithyourserviceprovidertoclassifyVOIPanddatatrafficaccordingtothedifferentserviceRFCs.HowcanyourdataandVOIPtrafficbemarked？（）

A.data marked with DSCP AF21，VOIP marked with DSCP EF
B.data marked with DSCP AF51，VOIP marked with DSCP EF
C.data marked with the DE-bit. VOIP marked with the CLP-bit
D.data marked with DSCP EF，VOIP marked with DSCP AF31
E.data marked with IP precedence 5，VOIP marked with DSCP EF

单项选择题Anexpandingcompanyisdeployingleasedlinesbetweenitsmainsiteandtworemotesites.Thebandwidthoftheleasedlinesis128kb seach，terminatedondifferentserialinterfacesonthemainrouter.TheselinksareusedforcombinedVOIPanddatatraffic.Thenetworkadministratorhasimplementeda VOIPsolutiontoreducecosts，andhasthereforereservedsufficientbandwidthinalowlatencyqueueoneachinterfacefortheVOIPtraffic.Usersnowcomplainaboutbadvoicequalityalthoughnodropsareobservedinthelowlatencyqueue.Whatactionwilllikelyfixthisproblem？（）

A.mark VOIP traffic with IP precedence 6 and configure only fair-queue’ on the links
B.configure the scheduler allocate 3000 1000 command to allow the OoS code to have enough CPU   cycles
C.enable class-based traffic shaping on the VOIP traffic class
D.enable Layer 2 fragmentation and interleaving on the links
E.enable Frame Relay on the links and send voice and data on different Frame Relay PVCs

单项选择题TheclassicSpanningTreeProtocol（802.1D1998）useswhichsequenceofvariablestodeterminethebestreceivedBPDU？（）

A.1） lowest root bridge id，2） lowest sender bridge id，3） lowest port id，4） lowest root path cost
B.1） lowest root path cost，2） lowest root bridge id，3） lowest sender bridge id，4） lowest sender port id
C.1） lowest root bridge id，2） lowest sender bridge id，3） lowest root path cost，4） lowest sender port id
D.1） lowest root bridge id，2） lowest root path cost，3） lowest sender bridge id，4） lowest sender port id

单项选择题WhichofthesebestdescribestheactionstakenwhenaVTPmessageisreceivedonaswitchconfiguredwiththeVTPmode transparent ？（）

A.VTP updates are ignored and forwarded out all ports.
B.VTP updates are ignored and forwarded out trunks only.
C.VTP updates are made to the VLAN database and are forwarded out trunks only.
D.VTP updates are ignored and are not forwarded.

单项选择题WhenSTPUplinkFastisenabledonaswitchutilizingthedefaultbridgepriority，whatwillthenewbridgeprioritybechangedto？（）

A.8192
B.16384
C.49152
D.65535