After OSPF is configured on the two routers, the administrator configures commands on RTA. Which of the following descriptions is correct? ()

• A.The neighbor relationship between the two routers will not be affected
• B.The neighbor relationship between the two routers will be down
• C.RTA. will continue to receive and analyze and process OSPF packets sent by RIB.
• D.RTA. Will no longer send OSPF packets

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Which statement about the dynamic AC. address table is correct?

• A.After the device restarts, the previously saved entries will not be lost
• B.The dynamic MAC obtained through the source AC. Address learning in the message. The table entries will age
• C.By viewing the number of specified dynamic MAC. address table entries, you can get the number of users communicating under the interface. After the device restarts, the previous dynamic table entries will be lost
• D.After the device restarts, the previous dynamic entries will be lost

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Which of the following descriptions about OSPF's DD. packets and LSA. is correct ()*

• A.The header of an LSA can uniquely identify an LSA
• B.The LSA header is only a small part of the LSA
• C.DD packets only contain the header information of LSA
• D.The DD packet contains the detailed information of the LSA

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Which of the following statements about the output on the router R1 shown in the figure is false?

• A.The broadcast address of Ethernet 0/0/0 is 10.0.12.255.
• B.The physical link of Ethernet 0/0/0 is working normally.
• C.The MTU of Ethernet 0/0/0 is 1480.
• D.The IP address of Ethernet 0/0/0 is 10.0.12.1/24.

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Which of the following is the default port number of the Telnet server?

• A.22
• B.24
• C.21
• D.23

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