Which of the following statements regarding layer-2 switch is incorrect?

• A.The layer-2 header is modified before the received packet is transmitted.
• B.The layer-3 header is modified before the received packet is transmitted.
• C.The switch learns MAC addresses automatically.
• D.The layer-2 LAN switch operates at data link layer.

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Referring to the output result as shown in the figure, it can be judged that the routing table of the router is composed of a direct route and a static route, and the direct route is The route priority value cannot be modified.

• A.Error
• B.Correct

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Command port trunk permit vlan all what effect ().

• A.If equipped with remote devices connected to port default vlan 3 commands, the VLAN 3 between the two devices cannot communicate
• B.peering devices can dynamically determine who is allowed by the VLAN ID
• C.This allows all of the VLAN on the port by
• D.The port is connected with the peer port must be configured port trunk permit vlan all

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<Huawei>system view
[Huawei]command privilege level 3 view user save
The correct statement about the above configuration command is ()

• A.Modify the permission level of the save command in the user view to 3
• B.Modify the user's permission level to 3, and save the configuration
• C.Modify the user view command to a permission level of 3, and save the configuration
• D.Modify the save command of a user to have a permission level of 3

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Which authentication modes does AAA support on Huawei AR G3 series routers? (Multiple choice)

• A.None
• B.Local
• C.802.1x
• D.HWTACACS

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