According to the command output as shown in the figure, the correct one in the following description is ().

• A.If you want to change the GigabitEthernet/0/1 port to an Access port, you first need to use the command
  "undo port trunk allow-pass vlan 2 to 4094
• B.GigabitEtheret0/0/1 does not allow VlAN1 to pass
• C.GigabitEthernet0/0/1 allows VlAN1 to pass
• D.If you want to change the GigabitEthernet0/0/1 port to an Access port, you first need to use the command "undo port trunk allow-pass vlan all"

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The RSTP protocol uses the P/A mechanism to speed up the upstream port's transition to the Forwarding state, but what is the reason for no temporary loop? ()

• A.Speed up port role election
• B.Ensure that there will be no temporary loops through the synchronization mechanism
• C.Reduced the time of ForwarD.Delay
• D.Edge port

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The link aggregation interface can only be used as a Layer 2 interface (C)

• A.True
• B.False

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Before the STA associates with the AP, it needs to exchange some messages to obtain the SSID. What are these messages?

• A.Probe Response
• B.Beacon
• C.Probe Request
• D.Discovery

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When the IPv4 protocol is used as the network layer protocol, which field is not included in the network layer header? ()

• A.Source IPv4 Address
• B.Sequence Number
• C.Destination IPv4 Address
• D.TTL

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