The statement about OSPF AS-External-LSA, which is correct? (Multiple choice)

• A.Net mask is set to all 0
• B.Advertising Router is set to the Router ID of ASBR
• C.Use Link State ID and Advertising Router to uniquely identify an AS-External-LSA
• D.Link State ID is set as the destination network segment address

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Which of the following descriptions about MP-BGP is wrong?

• A.MP-BGP introduces two new optional non-transition path
  attributes: MP_REACH_NLRI and MP_UNREACH_NLRI
• B.A router that supports MP-BGP cannot interact with a router that only supports BGP-4
• C.MP-BGP can carry multiple network layer protocols
• D.MP-BGP can isolate the routing information of different address clusters from each other

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Which of the following attributes must be recognized by all BGP devices and exist in Update messages?

• A.Optional non-transition
• B.Optional Transition
• C.Admittedly arbitrary
• D.Recognized and must be followed

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When creating a single-hop BFD session for the first time, bind the single-hop BFD session to the peer IP address and the local address. To modify a configured BFD session, delete it and create a new one.

• A.TRUE
• B.FALSE

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There is a wireless access controller serving as a DHCP relay. If the DHCP client cannot obtain an IP address dynamically, which of the following reasons may be the cause? (Multiple choice)

• A.In the global view of the wireless access controller, there is no DHCP server group bound.
• B.In the wireless access controller interface view, dhcp select relay is not configured.
• C.In the wireless access controller interface view, the proxy DHCP server is not specified.
• D.In the wireless access controller global view, the DHCP server function is not enabled.

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