多項選擇題Which of the following statements about MD5 Routing Updates authentication is valid？ （）

A.The MD5 algorithm inputs the routing updates of arbitrary length and outputs a 128-bit hash
B.The MD5 algorithm inputs the routing updates of every 64bit length and outputs an 8-bit hash
C.Multiple keys are supported
D.Routing updates packets are delivered in encrypted messages
E.Shared secret keys are delivered in encrypted messages


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1.單項選擇題What is the importance of using Virtual Output Queues on ingress Line Cards in a high-end router？（）

A.Prevents head-of-line blocking
B.Uses less memory
C.Increases forwarding performance
D.Simplifies configuration

2.單項選擇題In Any Transport over MPLS （AtoM） Control word is an optional 4-byte field used in the pseudowire packet.The control word carries generic and Layer 2 payload-specific information to emulate L2 packets correctly.In pseudowire packet， where is this Control Word inserted？（）

A.Inserted between the MPLS label stack and the Layer 3 payload
B.Inserted between the MPLS label stack and the Layer 3 Header
C.Inserted between the MPLS label stack and the Layer 2 payload
D.Inserted between the MPLS label stack and the Layer 2 header

3.單項選擇題What best explains the BGP route-reflector function？（）

A.BGP route-reflector should be in forwarding path of data coming from its clients
B.BGP route-reflector does not have to be in the forwarding path of data coming from its clients
C.BGP route-reflector will stop reflecting the routes if they’re not directly-connected clients
D.None of the above

4.單項選擇題Which of the following events can NOT be tuned via router configuration to provide for faster convergencefollowing a link failure？（）

A.Failure detection
B.Failure reporting
C.IGP LSP/LSA originatio
D.Per-hop flooding time of new link state
E.Number of hops that need to be notified of new link state

5.單項選擇題What is a limitation of implementing uRPF？（）

A.MPLS LDP must be enabled.
B.BGP routing protocol must be running.
C.Named access-lists must be configured.
D.Symmetrical routing is required.
E.Domain name must be defined