Which of the following description about the Layer 2 Ethernet switch is incorrect?

• A.Forward according to the Layer 2 header information of the Ethernet frame
• B.Layer 2 Ethernet switches work at the data link layer
• C.It is necessary to make certain modifications to the layer 3 header of the forwarded message, and then forward it
• D.Able to learn MAC address

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

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Which of the following fields is not included in the HELLO packet of the OSPF protocol?

• A.Sysname
• B.Neighbor
• C.Hellointerval
• D.Network mask

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Which of the following types of addresses is not included in IPv6 addresses?

• A.Unicast address
• B.Anycast address
• C.Multicast address
• D.Broadcast address

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The management of users by NAS devices is based on domains. Each user belongs to a domain, and a domain is a group of users who belong to the same domain.

• A.FALSE
• B.TRUE

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