In a wide area network (WAN) OSPF network, in which of the following scenarios is it necessary to deploy "OSPF Virtual Links " to solve the problem of routing interoperability between areas?
(Multiple choice)

• A.Use only static routes to connect non-backbone areas; no virtual links are needed.
• B.All areas are directly connected to Area 0, requiring no virtual links.
• C.In a Layer 2 network, OSPF virtual links are not required .
• D.The backbone area Area 0 is divided into two parts, requiring virtual link connections.
• E.Non-core regions (such as Area 1) are not directly connected to the core region (Area 0).

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(After NAT traversal is enabled, if a NAT device is detected during IKE negotiation between two gateways, ESP packets are encapsulated with a UDP header. Both the source and destination port numbers are set to
________ (Enter only digits.) in the header. This enables ESP packets to pass through the NAT device.)

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In the deployment of the OSPF protocol in a wide area network, what is the core function of the ABR (Area Border Router)?

• A.Forward routes only within a single OSPF area, not across areas.
• B.Connect different OSPF areas and pass inter-area routes (such as Type 3 LSA).
• C.Disable OSPF and use static routes to connect different areas.
• D.Only external AS routes (Type 5 LSA) are transmitted; inter-area routes are not transmitted.

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In an MPLS VPN network, which of the following descriptions conforms to the forwarding logic of the "MPLS label stack "?

• A.When receiving data packets, the CE device must remove all MPLS labels before forwarding them.
• B.The inner label is used for backbone network forwarding path identification, and the outer label is used for VPN instance identification.
• C.When a data packet carries multiple layers of tags, the device always processes the innermost tag first.
• D.The device forwards data packets based on the outer label, and then removes the outer label after forwarding.

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In Huawei's wide area network solution, for "video-on-demand (VOD) traffic transmitted across regions", which of the following technologies can "achieve localized distribution of video content and reduce user access latency"?

• A.Limit the number of simultaneous video requests by users to avoid network congestion.
• B.Deployment of a video content edge distribution network (CDN) (caching popular videos on nodes near branches)
• C.Reduce the video content bitrate, sacrificing clarity for lower latency.
• D.All video content is transmitted directly from the headquarters video server and is not distributed.

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