In RSTP, which port can provide the backup path to reach the root node of the spanning tree? What status is the port in?

• A.Root port and Listening status
• B.Alternate port and Forwarding status
• C.Alternate port and Discarding status
• D.Alternate port and Learning status
• E.Designated port and Listening status

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What do we usually call the devices in the MPLS BGP VPN domain? (Multiple choice)

• A.CP
• B.User router
• C.PE
• D.P

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As shown in the following figure, a part of the LSP of the LSDB of a router is shown in the first line of the figure. First received a new LSP, the second hop in the following picture, which of the following statement is wrong?

• A.The router will put the newly received LSP into the LSDB.
• B.If it is a point-to-point network, this router will send PSNP
• C.If it is a broadcast network, the DIS will include the summary information of the LSP in the next CSNP packet.
• D.This router will ignore the LSP received from the neighbor.

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ISIS will elect DIS in the broadcast multi-access network. Which of the following statement about DIS is correct? (Multiple Choice)

• A.ISIS elects the DIS by comparing the priorities and compares the MAC addresses if the priorities are the same.
• B.DIS guarantees database synchronization by periodically sending CSNP messages
• C.DIS supports the preemption function. After the new DIS preemption is successful, you do not need to flood any LSP packets.
• D.In a broadcast multi-access network, the DIS sends Hello PDUs three times as often.

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Broadcast-type network, starting the election of DIS after the establishment of the neighbor relationship

• A.False
• B.True

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