Question

question 15
3 pts
item 15 (3 points) flow control manages traffic between two devices. match the three flow
control methods below with advantages and disadvantages.
stop-and-wait
choose
go-back-n sliding window
choose
sends one frame at a time; waits for ack; frame resent if ack is late; high traffic created; slow
only un-ack resent; recipient will reorganize; more efficient; more complex
transmit multiple frames; wait for all ack; resends all frames if no ack; med-high traffic created
selective repeat sliding window
choose

Explanation:

• Stop - and - wait: This flow control method works by sending one frame at a time. After sending a frame, it waits for an acknowledgment (ACK). If the ACK is late, the frame is resent. Since it sends one frame at a time and waits, it can create high traffic and is relatively slow. So the description "Sends one frame at a time; waits for ack; frame resent if ack is late; high traffic created; Slow" matches Stop - and - wait.
• Go - back - n sliding window: In this method, multiple frames are transmitted. The sender waits for all ACKs. If there is no ACK, all the frames are resent. This creates medium - high traffic. So the description "Transmit multiple frames; wait for all ACK; resends all frames if no ACK; med - high traffic created" matches Go - back - n sliding window.
• Selective repeat Sliding window: Here, only the un - ACKed frames are resent. The recipient will reorganize the frames. This method is more efficient but also more complex. So the description "Only un - ACK resent; recipient will reorganize; more efficient; more complex" matches Selective repeat Sliding window.

Answer:

• Stop - and - wait: Sends one frame at a time; waits for ack; frame resent if ack is late; high traffic created; Slow
• Go - back - n sliding window: Transmit multiple frames; wait for all ACK; resends all frames if no ACK; med - high traffic created
• Selective repeat Sliding window: Only un - ACK resent; recipient will reorganize; more efficient; more complex