Command IP as-path-filter1 permit^12,*74$ can match to which AS_PSTH?

• A.AS PATH Q236217? 2374)
• B.AS_PATH(32127423)
• C.AS_PATH(321122374)
• D.AS_PATH(125 328 74 23)

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The correct description of the extended features of ISIS is?

• A.When the amount of information in the Link State Protocol data packet PDU to be released by ISIS is too large, the ISIS router will generate multiple LSP shards to carry more ISIS information.
• B.If there are other vendors' devices on the network and do not support the LSP sharding function, the sharding expansion mode must be configured as Model-1, otherwise the message will not be recognized by other vendors' devices.
• C.ISIS can choose whether to authenticate incoming SNP and LSP packets
• D.After you enable the LSP shard extension feature of your router, you can use it without restarting the ISIS process.

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Which of the following descriptions of MPLS header TTL are correct?

• A.Can prevent wireless circular forwarding of messages
• B.When copying TTL is disabled, tracert can see the LSR of the passing MPLS domain
• C.Copy IPTIL value is handled in such a way that the LSR of the MPLS domain is hidden, which plays a certain security role
• D.MPLS has two ways of handling TTL, one is that the IP packet copies the PTTL of the MPLS header hen it enters the MPLS network Value; Another is to set the TTL of the MPLS header to 255 at the entrance LER

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The following statement about the application of BFD is correct?

• A.The one-arm echo function refers to the detection of the connectivity of the forwarding link through the loopback operation of the BFD packet
• B.BFD and OSPF linkage is to associate BFD and OSPF, and notify OSPF through BFD's rapid sensing of link failures, thereby speeding up OSPF Response to changes in network topology
• C.BFD single-hop detection refers to the IP connectivity detection of two direct-connected systems
• D.BFD multi-hop detection means that BFD can detect arbitrary paths between two systems that may span many hops or overlap in some parts

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CORRECT TEXT
When judging the old and new LSA, the serial number parameter and the age parameter are used, and the following two parameters are correct for? (Multiple choice questions).

• A.Both the serial number and age parameters can determine whether the LSA is old or new, and the router prioritizes the sequence to participate in the teaching, and the larger the better
• B.If the serial number of the LSA reaches the end value of Ox7FFFFFFF, the current router advertises an LSA with an age of 3600S
• C.When the router receives-The age of the LSA is set to 3600S, the LSA is unavailable
• D.When the router receives two LSAs, where the sequence number is the same and the checksum is the same, the smaller the age, the better

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