The MAC address table of existing switches is shown in the figure. Which of the following statement is correct?

• A.The MAC address 5489-9811-0b49 is manually configured by the administrator
• B.The MAC address 5489-989d-1d30 is manually configured by the administrator
• C.After the switch restarts, all MAC addresses need to be relearned
• D.The MAC address 5489-9885-18a8 is manually configured by the administrator

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What kind of message does the DHCP server use to confirm that the host can use the IP address?

• A.DHCP ACK
• B.DHCP OFFER
• C.DHCP REQUSET
• D.DHCP DISCOVER

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A device has been configured to complete the Telnet configuration. The device login address is 10.1.1.10. The Telnet user name is admin and the password is Huawei@123. Which of the following is the correct way to log in to this device using telnetlib?

• A.telnetlib.Telnet （ 10.1.1.0 )
• B.telnetlib.Telnet （ 10.1.1.0,23,admin,Huawei@123 )
• C.telnetlib.Telnet （ 10.1.1.0,admin )
• D.telnetlib.Telnet （ 10.1.1.0,23, Huawei@123 )

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SNMPv1 defines 5 protocol operations.

• A.False
• B.True

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In the network shown in the figure below, all routers run the OSPF protocol, and the link cost value is shown in the figure. What is the cost value of the route entry to the network 10.0.0.0/8 in the RTA routing table?

• A.100
• B.20
• C.60
• D.70

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