What is the value of OSPF and BFD linkage?

• A.The hello sending interval of OSPF is at the second level, which is faster than the BFD sensing link state
• B.Through the BFD detected at the millisecond level, the OSPF status is associated to achieve the purpose of OSPF quickly sensing the link status
• C.Any change in the BFD status will not affect the OSPF neighbor status
• D.The sending interval of BFD packets can reach the millisecond level, which is slower than the OSPF sensing link state

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An engineer uses two routers to test IPv6 services, and simulates the interconnection between headquarters and branches by running BGP4+.

The logical topology of the network is shown in the figure. Regarding the transmission of IPv6 routes between two devices, which of the following statements is wrong?

• A.If the Update message carries the MP_REACH_NLRI attribute, it means that the advertised route is reachable
• B.When routing is transmitted, it will carry recognized mandatory attributes such as AS_Path
• C.When routing, the Next_Hop attribute must be an IPv6 global unicast address
• D.BGP4+ transmits routing information between peers through Update packets

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Which of the following functions will affect BGP neighbor establishment? (Multiple choice)

• A.BGP authentication
• B.BGP GSTM
• C.ebgp max hop
• D.BGP route filtering

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Traditional BGP-4 can only manage IPv4 unicast routing information. In order to provide support for multiple network layer protocols, MP-BGP extends BGP-4.
MP-BGP uses address families to distinguish different network layer protocols. Which of the following address families are currently supported? (Multiple Choice)

• A.DBGP-IPv4 broadcast address family
• B.BGP-VPNv4 address family
• C.BGP-VPN instance IPv6 address family
• D.BGP-IPv6 unicast address family

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In order to allow the routers at both ends of the IPv6 over IPv4 manual tunnel to exchange routing information, OSPFv3 can be enabled on the tunnel. OSPFv3 will be able to form a neighbor relationship normally, and the tunnel interface will be treated as a P2P link interface.

• A.FALSE
• B.TRUE

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