The function of 0SPF hello message is (). (Multiple Choice)

• A.Neighbor discovery
• B.Synchronize the LSDB of the router
• C.Maintain neighbor relations
• D.Update LSA information

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NAPT distinguishes the IP addresses of different users through the protocol numbers in TCP, UDP, or IP packets.

• A.True
• B.False

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Network shown below, Host A does not configure the gateway, the host B exists gateway ARP cache, which of the following statements are correct? (Multiple choice)

• A.Enable ARP proxy on the GO/0/1 port of the router, then host A can communicate with host B
• B.Host A and Host B cannot communicate in both directions
• C.The data packet sent by host B with the destination IP address of 10.0.12.1 can be forwarded to host A
• D.The data packet sent by host A with the destination IP address of 11.0.12.1 can be forwarded to host B

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Which of the following levels is not a common network level in mid-sized campus network architecture?

• A.Access layer
• B.Core layer
• C.Network layer
• D.Convergence layer

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If the broadcast address of a network is 172.16.1.255, what might its network address be?

• A.172.16.1.128
• B.172.16.2.0
• C.172.16.1.1
• D.172.16.1.253

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