How do you calculate throughput using back and protocol?
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How do you calculate throughput using back and protocol?
Solution-
- Bandwidth = 1 Mbps.
- Distance = 2 x 36504 km = 73008 km.
- Propagation speed = 3 x 108 m/sec.
- Efficiency = 25% = 1/4.
- Go back N is used where N = 127.
Which protocol Go back N or Selective Repeat more efficient use of network bandwidth Why?
Selective Repeat requires large number of bits in sequence number field. Selective Repeat is far better than Go back N in terms of retransmissions required. Bandwidth requirement is high because even if a single packet is lost, entire window has to be retransmitted.
What is the efficiency of the Go-Back-N ARQ?
In Go-Back-N ARQ, N is the sender window size, which we can see in the above example was 5. Now, here N should be greater than 1 in order to implement pipelining. If N=1, then our system reduces to Stop & Wait protocol. Now the efficiency of Go-Back-N ARQ = N/(1+2a), where a = tp/tt.
What is the difference between Selective Repeat ARQ and Go-Back-N ARQ?
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 receiver window size in Go-Back-N ARQ?
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It is a special case of the general sliding window protocol with the transmit window size of N and receive window size of 1. It can transmit N frames to the peer before requiring an ACK. The receiver process keeps track of the sequence number of the next frame it expects to receive.
Why Go-Back-N ARQ is more efficient as compared to Stop and Wait?
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.
Why Go-Back-N ARQ is more efficient as compared to stop-and-wait?
What is the advantage of selective repeat ARQ over Go-Back-N 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.
Why Go-Back-N ARQ is more efficient as compared to stop and wait?
How Windows size is important for Go-Back-N ARQ?
Important points related to Go-Back-N ARQ: In Go-Back-N, N determines the sender’s window size, and the size of the receiver’s window is always 1. It does not consider the corrupted frames and simply discards them. It does not accept the frames which are out of order and discards them.
How do you determine window size for Go-Back-N?
The size of the sending window determines the sequence number of the outbound frames. If the sequence number of the frames is an n-bit field, then the range of sequence numbers that can be assigned is 0 to 2n−1. Consequently, the size of the sending window is 2n−1.
What is the max window size for Go-Back-N?
Go-Back-N the maximum window size is: w= 2^m -1 w=255. Selective Repeat the maximu window size is: w=(2^m)/2 w=128.
What is the main advantage of using Go-Back-N ARQ protocol over Stop and Wait ARQ protocol?
What is window size in ARQ?
In Go-Back-N ARQ, the size of the send window must be less than 2m; the size of the receiver window is always 1. Stop-and-Wait ARQ is a special case of Go-Back-N ARQ in which the size of the send window is 1. In Selective Repeat ARQ, the size of the sender and receiver window must be at most one- half of 2m.
Why Go-Back-N ARQ is more efficient as compared to Stop-and-Wait?
