多項選擇題RIPv2 differs from RIPv1 in that：（）

A.it uses multicast address 224.0.0.10，instead of broadcast
B.it uses multicast address 224.0.0.9，instead of broadcast
C.it can use either multicast or broadcast addresses，instead of just broadcast
D.it sends incremental updates，instead of periodic updates
E.it is classless，instead of classful
F.it supports authentication，and RIPv1 does not


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1.單項選擇題What is the requirement of Remote Triggered Black Hole （RTBH ） filtering？（）

A.IBGP updates exchange between trigger router and black hole router
B.EBGP updates exchange between trigger router and black hole router
C.OSPF updates exchange between trigger router and black hole router
D.ISIS updates exchange between trigger router and black hole router

2.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

3.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

4.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

5.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