Which of the following statements about BFD applications are correct? (Multiple choice)

• A.The single-arm echo function is to detect the connectivity of the forwarding link through the loopback operation of BFD packets
• B.BFD single-hop detection refers to the IP connectivity detection of two directly connected systems
• C.BFD multi-hop detection means that BFD can detect any path between two systems. These paths may span many hops or overlap in some parts.
• D.The linkage between BFD and OSPF is to associate BFD with OSPF, and notify OSPF through BFD's rapid detection of link failures, thereby accelerating OSPF's response to network topology changes

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egarding MP-BGP, which is wrong in the following description?

• A.MP-BGP's message type and VPNv4 route advertisement policy are the same as BGP-4
• B.MP-BGP advertises VPNv4 routes through two attributes: MP_REACH_NLRI and MP_UNREACH_NLRI
• C.When the PE and CE exchange routes through BGP, you need to create a BGP process for each VPN instance on the CE
• D.MP-BGP needs to assign private network labels to VPNv4 routes

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Which of the following description about the label space of MPLS is wrong?

• A.If the outgoing label value is 0, the router will directly discard the packet
• B.When the penultimate hop LSR performs label switching, if the value of the label after the exchange is found to be 3, the label will be ejected by default and the packet will be sent to the last hop
• C.16~1023 is the label space shared by static LSP and static CR-L SP
• D.Above 1024 is the label space shared by dynamic signaling protocols such as LDP, RSVP-TE, MP-BGP, etc.

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When DLDP detects that a unidirectional link exists in the optical fiber, the default operations of the Huawei device include: DLDP state machine migrates to the Disable state, outputs trap information, automatically sets the interface to the blocked state.

• A.True
• B.False

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Cross-device link aggregation enables data stream transmission and mutual backup of stack member switches. However, because of the limited bandwidth of stack cables between stack devices, which of the following methods can improve forwarding efficiency?

• A.Configure stack system MAC address switching
• B.Connect stack devices through stack cards
• C.Enable traffic local priority forwarding
• D.Enable stack multi-master check function

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