Which of the following descriptions about IPsec IKEv1 is correct?

• A.Two IKE SAs need to be established between two IPSec peers to transmit control packets and data packets respectively
• B.After IKE phase one is established, all ISAKMP messages between peers will pass encryption and verification
• C.The successful negotiation of IKE does not mean that the two-way IPSec tunnel has been established
• D.The purpose of phase one of IKE negotiation is to transmit IPSec SA data

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Which of the following option packets belong to OSPF protocol packets? (Multiple choice)

• A.Hello
• B.LSU
• C.LSA
• D.LSR

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As shown in the following figure, a new AP is deployed In dual link MSB networking (load balancing mode).
Which AC will the connect to?

• A.AC1
• B.Random access
• C.None
• D.AC2

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The (*, G) routing table entry in multicast routing can guide packet forwarding.

• A.FALSE
• B.TRUE

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For link state routing protocols, the use of multi-region and hierarchical network design can speed up route convergence, reduce the load of devices in a single area, and make the network more scalable.

• A.TRUE
• B.FALSE

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