An OSPF protocol is running on a company network. An engineer wants to understand the OSPF mechanism to perform packet capture operations on the network, which of the following description about the OSPF packet is correct? (Multiple Choice)

• A.LS Update message synchronizes the link state database by sending detailed LSA information.
• B.Sending Hello packets immediately after the interface joins the OSPF area.
• C.The LS Update message is sent only when the adjacency is established.
• D.After receiving the LS Update message, the router must send LS Ack to confirm.

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As shown in the figure, in the hub&spoke multicast mode of MPLS bgp VPN, in order to realize that the branch can only communicate with the headquarters, the branches cannot communicate with each other. Which of the following schemes can the RT be set?

• A.Headquarters: Import Target: 1:1 Export Target: 3:3 Branch 1: Import Target: 3:3 Export Target: 1:1 Branch 2: Import Target: 3:3 Export Target: 2:2
• B.Headquarters: Import Target: 2:2 Export Target: 3:3 Branch 1: Import Target: 3:3 Export Target: 1:1 Branch 2: Import Target: 3:3 Export Target: 2:2
• C.Headquarters: Import Target: 12:3 Export Target: 3:12 Branch 1: Import Target: 3:12 Export Target: 12:3 Branch 2: Import Target: 3:12 Export Target: 12:3
• D.Headquarters: Import Target: 12:3 Export Target: 12:3 Branch 1: Import Target: 12:3 Export Target: 12:3 Branch 2: Import Target: 12:3 Export Target: 12:3

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Which of the following command is displayed to determine that the loop fault of the switch is generated?

• A.
• B.
• C.
• D.

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

• A.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.
• 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.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.
• 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 is not the role of EVPN Type2 routing?

• A.Host IP route Announcement
• B.BUM message forwarding
• C.Host ARP Announcement
• D.Host MAC address Announcement

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