What is drawback of Go back N protocol?

What is drawback of Go back N protocol?

But it can also result in a huge drawback which is, if one acknowledgment is lost then it means that all the data packets transmitted are lost. Independent Ack: Here every data packet gets acknowledged independently. Here the reliability is high, but the main drawback is high traffic.

What is the main advantage of using Go Back N ARQ protocol over stop and wait ARQ protocol?

Go-Back-N ARQ is a more efficient use of a connection than Stop-and-wait ARQ, since unlike waiting for an acknowledgement for each packet, the connection is still being utilized as packets are being sent. In other words, during the time that would otherwise be spent waiting, more packets are being sent.

In what situation GBN is better than selective repeat?

Go back N is better than Selective Repeat in terms of implementation difficulty. Sending cumulative acknowledgements reduces the traffic in the network but if it is lost, then the ACKs for all the corresponding packets are lost. Go back N and Selective Repeat are better in terms of channel usage.

What is the one most important difference between Go back N and selective repeat ARQ?

The main difference between these two protocols is that after finding the suspect or damage in sent frames go-back-n protocol re-transmits all the frames whereas selective repeat protocol re-transmits only that frame which is damaged.

What are disadvantages of stop and wait ARQ?

disadvantages of stop-and-wait: fairly slow: the sender can send at most one new packet per RTT. not robust: if the ack can get lost, when the receiver gets a packet, the receiver cannot tell if it is a retransmission or a new packet.

What is main disadvantage of stop and wait protocol?

Major drawback of Stop-and-Wait Flow Control is that only one frame can be in transmission at a time, this leads to inefficiency if propagation delay is much longer than the transmission delay.

How can say that selective repeat protocol is better than to stop and wait protocol?

Go back N and Selective Repeat gives better efficiency than Stop and Wait ARQ. Buffer requirement in Selective Repeat is very large. If the system does not have lots of memory, then it is better to choose Go back N. Selective Repeat requires large number of bits in sequence number field.

What are the pros and cons between Go-Back-N and selective repeat?

Go-back-N: pro: single timer, simple con: not efficient, waste bandwidth when a packet is lost/broken.

Selective repeat: pro: efficient, only lost/broken packets need retransmission con: complicated with multiple timers, receiver needs a buffer to buffer out-of-order packets.

What is the difference between Go-Back-N and selective repeat Sliding Window protocols explain using an example?

Both Go-Back-N and Selective Repeat protocols are sliding window protocols. In Go-Back-N if a sent frame is found suspected or damaged then all the frames are retransmitted till the last packet. In Selective Repeat, only the suspected or damaged frames are retransmitted.

What is the difference between stop and wait and gobackn?

In Stop and Wait protocol, Efficiency formular is 1/ (1+2*a) where a is ratio of propagation delay vs transmission delay. In GoBackN protocol, Efficiency formular is N/ (1+2*a) where a is ratio of propagation delay vs transmission delay and N is number of packets sent.

What are the disadvantages of stop and wait ARQ?

Stop-and-wait ARQ. Stop-and-wait ARQ is inefficient compared to other ARQs, because the time between packets, if the ACK and the data are received successfully, is twice the transit time (assuming the turnaround time can be zero). The throughput on the channel is a fraction of what it could be.

What is the difference between Selective Repeat and stop and Wait protocol?

In Selective Repeat protocol, Efficiency formular is N/ (1+2*a) where a is ratio of propagation delay vs transmission delay and N is number of packets sent. In Stop and Wait protocol, Acknowledgement type is individual.

What is an example of stop-and-wait?

If the ACK does not reach the sender before a certain time, known as the timeout, the sender sends the same frame again. The timeout countdown is reset after each frame transmission. The above behavior is a basic example of Stop-and-Wait.