Which of the following is true about the flag field in the HDLC frame? (multiple choice)
A. The fixed value is 01111110
B. Start and end of the flag field flag frame
C. Two flag fields are required between the two frames at the beginning of the frame and at the end of the frame.
D. The channel is still active at the time of no frame transmission. In this state, the sender continuously sends the flag field, and the receiver detects each received flag field.
Directly connected to the specified port of the peer device, does not forward any packets, but which port is the port that receives BPDUs to monitor network changes?
A. Root Port
B. Designated Port
C. Alternate Port
D. Disable Port
Directly connected to the specified port of the peer device, does not forward any packets, but which port is the port that receives BPDUs to monitor network changes?
A. Root Port
B. Designated Port
C. Alternate Port
D. Disable Port
What are the types of ICMP messages? (multiple choice)
A. ICMP transmission message
B. ICMP error report message
C. ICMP inquiry message
D. ICMP application message
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