多项选择题

Which 4 statements regarding MPLS Label Stack Encoding is true？（）

A.A value of 4 represents the "Implicit NULL Label."
B.A value of 0 represents the "IPv4 Explicit NULL Label."
C.A value of 1 represents the "Router Alert Label". The use of this label is analogous to the use of the"Router Alert Option" in IP packets （for example， ping with record route option）
D.A value of 2 represents the "IPv6 Explicit NULL Label"
E.A value of 1 represents the "IPv1 Explicit NULL Label"
F.A value of 3 represents the "Implicit NULL Label"

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多项选择题

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

单项选择题

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

多项选择题

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