What is the function of the command port trunk allow pass vlan all? ()

• A.If the port default vlan3 command is configured for the connected remote device, VLAN3 cannot communicate between the two devices
• B.All VLAN data frames are allowed to pass through this port
• C.The opposite port connected to the port must be configured with port trunk permit vlan all at the same time
• D.The connected peer device can dynamically determine which VLAN IDs are allowed.

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The mask length is 12 bits can be expressed as?

• A.255.240.0.0
• B.255.248.0.0
• C.255.255.255.0
• D.255.255.0.0

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As shown in the figure, if the command ping 10.1.1.2 is executed on R1, the data frame of VLAN 10 received from LSW2 by LSW1 is tagged. ()(True or False)

• A.False
• B.True

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Refer to the configuration of the single-arm routing in the figure below, you can judge that even if the ARP proxy is not enabled on the sub-interface of R1,The administrative department and the financial department can also visit each other. ()(True or False)

• A.True
• B.False

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The Backup port in RSTP can replace the failed root port.

• A.False
• B.True

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