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質問 1：
Click on the exhibit.
An LSP traverses the path R1-R2-R3. With one-to-one fast reroute enabled, which router becomes a DMP for the detour tunnels?
A. Router R4
B. Router R5
C. Router R2
D. Router R1
E. Router R3
正解：B
質問 2：
Click on the exhibit.
Which of the following about the bypass tunnel is FALSE?
A. One-to-one fast reroute protection is requested by an LSP.
B. The bypass-node tunnel is used to avoid the next-hop downstream router 10.10.10.3.
C. The bypass-link tunnel is used to avoid the link with the egress interface address
10.3.4.4.
D. The router 10.10.10.1 is a PLR providing node protection for the router 10.10.10.3.
正解：A
質問 3：
Which of the following fields does NOT appear in the MPLS label header?
A. Time To live
B. Frame check sequence
C. Label
D. Bottom of stack bit
E. Traffic Class (previously called Experimental)
正解：B
質問 4：
Click on the exhibit button below.
LSP 1's link between routers R3 and R6 has failed, and the RESV state at router R3 has timed out. Which of the following actions will router R3 initiate?
A. Send a PathTear message towards router R1.
B. Send a PathTear message towards router R6.
C. Send a ResvTear message toward router R1.
D. Send a ResvTear message toward router R6.
正解：C
質問 5：
Which of the following is a function of the control plane in an MPLS router?
A. Label swapping
B. Pushing a label on an unlabeled packet
C. Routing lookups
D. Label allocation
正解：D
質問 6：
Click on the exhibit.
Router R2 advertises an OSPF summary route 10.10.10.0/24 into Area 1. Router R3 receives labels for individual FECs 10.10.10.2/32 and 10.10.10.4/32. These two FECs are installed in router R3's LIB but not in the LFIB. What needs to be done on router R3 to install these labels into its LFIB?
A. Create an import policy to accept 10.10.10.2/32 and 10.10.10.4/32.
B. Disable route summarization on router R3.
C. Enable LDP aggregate prefix match.
D. Disable LDP exact match on 10.10.10.2/32 and 10.10.10.4/32.
正解：C
質問 7：
What is the purpose of the MPLS TC field (EXP bits)?
A. It is used to carry the TTL value.
B. Each implementation can use it as they see fit.
C. It is used to carry fragmentation flag information.
D. It is used to carry the Ether type value.
E. It is used to carry QoS classification.
正解：E
Click on the exhibit.
An LSP traverses the path R1-R2-R3. With one-to-one fast reroute enabled, which router becomes a DMP for the detour tunnels?
A. Router R4
B. Router R5
C. Router R2
D. Router R1
E. Router R3
正解：B
質問 2：
Click on the exhibit.
Which of the following about the bypass tunnel is FALSE?
A. One-to-one fast reroute protection is requested by an LSP.
B. The bypass-node tunnel is used to avoid the next-hop downstream router 10.10.10.3.
C. The bypass-link tunnel is used to avoid the link with the egress interface address
10.3.4.4.
D. The router 10.10.10.1 is a PLR providing node protection for the router 10.10.10.3.
正解：A
質問 3：
Which of the following fields does NOT appear in the MPLS label header?
A. Time To live
B. Frame check sequence
C. Label
D. Bottom of stack bit
E. Traffic Class (previously called Experimental)
正解：B
質問 4：
Click on the exhibit button below.
LSP 1's link between routers R3 and R6 has failed, and the RESV state at router R3 has timed out. Which of the following actions will router R3 initiate?
A. Send a PathTear message towards router R1.
B. Send a PathTear message towards router R6.
C. Send a ResvTear message toward router R1.
D. Send a ResvTear message toward router R6.
正解：C
質問 5：
Which of the following is a function of the control plane in an MPLS router?
A. Label swapping
B. Pushing a label on an unlabeled packet
C. Routing lookups
D. Label allocation
正解：D
質問 6：
Click on the exhibit.
Router R2 advertises an OSPF summary route 10.10.10.0/24 into Area 1. Router R3 receives labels for individual FECs 10.10.10.2/32 and 10.10.10.4/32. These two FECs are installed in router R3's LIB but not in the LFIB. What needs to be done on router R3 to install these labels into its LFIB?
A. Create an import policy to accept 10.10.10.2/32 and 10.10.10.4/32.
B. Disable route summarization on router R3.
C. Enable LDP aggregate prefix match.
D. Disable LDP exact match on 10.10.10.2/32 and 10.10.10.4/32.
正解：C
質問 7：
What is the purpose of the MPLS TC field (EXP bits)?
A. It is used to carry the TTL value.
B. Each implementation can use it as they see fit.
C. It is used to carry fragmentation flag information.
D. It is used to carry the Ether type value.
E. It is used to carry QoS classification.
正解：E
田中** -
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