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

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

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Huawei's two switches SWA and SWB are connected through 7 Ethernet ports and configured with static link aggregation. The corresponding ports on the switch SW are Ethernet1/0/2, Ethernet1/0/3, Ethernet1/0/4. Ethernet 1/0/5, Ethernet 1/0/6, and Ethernet 1/0/7 are configured in the order of the ports. If the switch SWA and SWB supports only 6 ports per aggregation group,

• A.In the case of each interface configuration consistent, Ethernet1/0/7 Unselected port
• B.In the case of each interface configuration consistent, SWA randomly select a port in 7 ports as aggregation Unselected port
• C.In the case of each interface configuration consistent, Ethernet1/0/6 Unselected port
• D.In the case of each interface configuration consistent, Ethernet1/0/1 Unselected port

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

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

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When the ABR is a Type 5/7 LSA switch router in the NSSA area, the ABR can aggregate the Type 5 LSAs converted from the Type 7 LSA.

• A.True
• B.False

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The configuration of two routers in a company is as follows. which of the following statement about the R1 routing table is correct?

• A.If the priority of the R2 ISIS protocol is adjusted to 5, the P route entry with the destination network segment of 10.0.2.2/32 on R1 is generated by ISIS.
• B.Only when the priority of the R2 ISIS protocol is adjusted to 5, the P route entry with the destination network segment of 10.1.2.2/32 on R1 is generated by OSPF.
• C.If the priority of the R1 ISIS protocol is adjusted to 5, the P route entry with the destination network segment of 10.0.2.2/32 on R1 is generated by ISIS.
• D.If the priority of the ISIS protocol of R1 is adjusted to 5, the P route entry of the destination network segment with the destination network segment of 10.1.2.2/32 is generated by OSPF.

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