Which AS_PATH can be matched by command ip as-path-filter 1 permit ^12.*74$?

• A.AS_PATH （ 32 1274 23 )
• B.AS_PATH （ 125 328 74 23 )
• C.AS_PATH （ 321 12 2374 )
• D.AS_PATH （ 123 621 743 2374 )

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When judging the old and new LSA, the serial number parameter and the age parameter will be used. Which of the following statements about the two parameters is correct?

• A.Both the serial number and the age parameter can judge the LSA is old or new, and the router preferentially compares the sequence parameters, the bigger, the better.
• B.When the router receives two LSAs, the serial number is the same, the checksum is the same, and the smaller the age, the better.
• C.If the serial number of the LSA reaches the end value of 0x7FFF, the current router advertises the age of 3600s for lsa.
• D.When the router receives an LSA age set to 360s, it means that the LSA is unavailable.

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MPLS BGP VPN is a Layer 3 VPN technology used to provide VPN solutions (PPVPN).
What are the basic components of MPLS BGP VPN?

• A.P and PE
• B.SP
• C.PE, P and CE
• D.CE and P

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After the BGP connection is successful and it is down again. What are the impossible reasons?

• A.Open packet negotiation failed.
• B.The mandatory attribute in the routing update message is lost.
• C.After the BGP connection is established, the keepalive packet is not received within the negotiated holdtime.
• D.Received incorrect BGP packets.

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

• A.R2 can learn the route 10.1.1.0/24.
• 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 all the routes of R1.

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