Regarding the way the device handles packets in the MPLS network model, which of the following description is wrong? (Multiple Choice)

• A.The device discards the IP packets entering the MPLS domain.
• B.Both LER and LSR will carry out label distribution.
• C.LSR must not strip labels.
• D.The label forwarding path LSP is determined and established through various protocols during the forwarding of the packet.

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What improvements have been made to the IGMPv2 protocol compared to IGMPv1? (Multiple Choice)

• A.Added specific group query message
• B.Added specific source group query messages
• C.Added maximum response time field
• D.Added off-group messages

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As shown in the following figure, what routes can R2 learn?

• A.R2 can learn all the routes of R1.
• B.R2 can learn routes 10.1.2.0/24 and 10.1.3.0/24.
• C.R2 can learn the LSPs of R1 but cannot add them to the routing table.
• D.R2 can learn the route 10.1.1.0/24.

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Which of the following command is displayed to determine that the loop fault of the switch is generated?

• A.
• B.
• C.
• D.

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In an IPv6 network, two nodes A and B are neighbors. If node A sends an NS message to node B, if node B replies to the NA message after received the message, so what neighbor status will be marked as when viewing on the node A?

• A.Reachable
• B.Probe
• C.Stale
• D.Incomplete

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