多項選擇題Which of these statements about penultimate hop popping are true？（）

A.It is used only for directly connected subnets or aggregate routes
B.It can only be used with LDP.
C.It is only used when two or more labels are stacked.
D.It enables the Edge LSR to request a label pop operation from Its upstream neighbors
E.It is requested through TDP using a special label value that is also called the implicit-null value.
F.It is requested through LDP using a special label value that is also called the implicit-null value.


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1.單項選擇題Which types of prefixes will a router running BGP most likely advertise to an IBGP peer， assuming it is notconfigured as a route reflector？（）

A.prefixes received from any other BGP peer and prefixes locally originated via network statements or redistributed
B.all prefixes in its routing table
C.prefixes received from EBGP peers and prefixes locally originated via network statements or     redistributed
D.prefixes received from EBGP peers and prefixes received from route reflectors
E.prefixes received from other IBGP peers， prefixes received from EBGP peers，and prefixes redistributedto BGP
F.prefixes received from other IBGP peers and prefixes received from route reflectors

3.單項選擇題You are the network administrator of an enterprise with a main site and multiple remote sites. Your networkcarries both VOIP and data traffic. You agree with your service provider to classify VOIP and data trafficaccording to the different service RFCs. How can your data and VOIP traffic be marked？（）

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

4.單項選擇題An expanding company is deploying leased lines between its main site and two remote sites. Thebandwidth of the leased lines is 128kb/s each，terminated on different serial interfaces on the main router.These links are used for combined VOIP and data traffic. The network administrator has implemented a VOIP solution to reduce costs，and has therefore reserved sufficient bandwidth in a low latency queue oneach interface for the VOIP traffic. Users now complain about bad voice quality although no drops areobserved in the low latency queue. What action will likely fix this problem？（）

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

5.單項選擇題The classic Spanning Tree Protocol （802.1 D 1998） uses which sequence of variables to determine thebest received BPDU？（）

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

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