QUESTION: 37

Which IPv6 header field has a function similar to that of the “Type of Service” field in an IPv4 header?

Flow Label
Traffic Class
Next Header
Version

Answer(s): B

Besides an IPv4 address, a router distinguisher (RD) also contains an identifier that distinguishes IP routes to the same destination IP address in different VPNs. How many bits are there in the identifier?

16
64
128
32

Answer(s): B

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QUESTION: 39

Which of the following statements about penultimate hop popping are true?

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

Answer(s): B,D,E

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QUESTION: 40

Based on the routing information exchange mode, MPLS VPNs are usually classified into two types. One is the overlay VPN. What is the other type of MPLS VPN?

L3 VPN
Virtual Private Network
L2 VPN
Peer-to-Peer VPN

Answer(s): D

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QUESTION: 40

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