Computer-Networks
August 29, 2024Computer-Networks
August 29, 2024Stop-and-Wait-ARQ
| Question 10 |
Automatic Repeat Request Protocol (ARQ) is used for reliable data transfer between two peers. Stop-and-Wait is one of the well known ARQ methods between a network sender agent A and a receiver agent B. ARQ requires retransmission of the previous frame or packet to take place when the retransmission timer is set after the time limit elapses.
The main problem with the Stop-and-Wait ARQ approach which needs improvement leading to Go-back N or Selective Repeat ARQ approaches is
| Stop-and-Wait is not actually reliable | |
| Stop-and-Wait cannot be used at the transport layer level | |
| Stop-and,-War’t requires wireless transmission | |
| Stop-and,-Wait is not at all efficient at utilizing the transmission capacity of the Iink |
Question 10 Explanation:
Stop and wait may cause big performance issues as sender always waits for acknowledgement even if it has next packet ready to send. Consider a situation where you have a high bandwidth connection and propagation delay is also high (you are connected to some server in some other country though a high speed connection). To solve this problem, we can send more than one packet at a time with a larger sequence numbers, which is done in GBN or SR protocol.
Correct Answer: D
Question 10 Explanation:
Stop and wait may cause big performance issues as sender always waits for acknowledgement even if it has next packet ready to send. Consider a situation where you have a high bandwidth connection and propagation delay is also high (you are connected to some server in some other country though a high speed connection). To solve this problem, we can send more than one packet at a time with a larger sequence numbers, which is done in GBN or SR protocol.
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