Which of the following statements about IS-IS (IPv6) are correct? (Multiple questions)

• A.To support the processing and calculation of IPv6 routing, IS-IS has added TLV 232, 236
• B.IS-IS works at the data link layer and only needs to add a new TLV to support IPv6
• C.By default, IS-IS enables the multi-topology feature
• D.In order to support the processing and calculation of IPv6 routing, IS-IS added NLPID in 129TLV

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When the payload is an ICMPv6 packet, if the extended header is not considered, what is the value of the Next Header field in the IPv6 header?

• A.78
• B.68
• C.58
• D.55

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The following are the statements about LDP reliability, which one is wrong?

• A.LDP GR Graceful Restart uses the feature that the MPLS forwarding plane is separated from the control plane. The device does not interrupt when the protocol is restarted or the active/standby switchover is performed.
• B.LDP FRR can also be used to generate an LSP for the label mapping from the non-optimal next hop. And it can be as a backup of the primary LSP to establish the transfer entries.
• C.The association between the LDP and the IGP requires the IGP to suppress the advertisement of the route and ensure that the LDP path is consistent with the IGP path.
• D.The manually configured LDP FRR policy defaults to a 32-bit backup route that triggers LDP to establish a backup LSP.

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Which of the following description is true about BGP aggregation?

• A.BGP enables automatic aggregation by default
• B.Manually aggregate routes in the BGP local routing table.
• C.For IPv6 routes, BGP supports manual aggregation and automatic aggregation.
• D.After the Aggregate ipv4-address mask is configured, only the aggregated routes are advertised and the detailed routes are not advertised.

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Although the STP protocol can solve the loop problem, the slow convergence of the network topology affects the user's communication quality. RSTP has made many improvements to STP. Which of the following is not an improvement of RSTP to STP?

• A.If a port does not receive the configuration BPDU sent by the upstream device within 4 consecutive Hello Time, the device considers that the negotiation with this neighbor has failed
• B.RSTP deletes 3 port states and adds 2 new port roles
• C.RSTP's port state specifications are divided according to whether the port forwards user traffic and learns MAC addresses, reducing the original five port states to three
• D.The non-root switch running RSTP sends configuration BPDUs at the interval specified by the Hello Timer. This behavior is completely performed by each device independently

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