How many bits are there in the VLAN ID in the VLAN frame format defined by IEEE802.1Q?

• A.12
• B.10
• C.8
• D.6

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ifoneLength/Type = 0X8100 taught by the Ethernet data, which of the following is correct? ()

• A.D. There must be a TCP header in the upper layer of this data frame
• B.B. There must be a UDP header in the upper layer of this data frame
• C.The upper layer of this data frame must existIP header

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When the Access type port sends a message, it will ().

• A.Type the PVID. information of this port, and then send it out
• B.C. Send tagged messages
• C.Strip the VLAN information of the high packet, and then send it out
• D.Add the VLAN information of the message, and then send it out

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As shown in the figure. All four switches are running $TP. Various parameters are set to default values. If the GO/0/2 port of switch C is blocked and cannot send configuration BPDUs through this port, how long will it take for the blocked port in the network to enter the forwarding state? () (Single-choice question)

• A.About 50 seconds
• B.D. About 3 seconds
• C.C. About 15 seconds

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If the packet matches the deny rule in an ACL, the packet is discarded.

• A.TRUE
• B.FALSE

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