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Recent questions tagged go-back-n

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GB-N
In GB-3, if every 4th packet that is being transmitted is lost and if we have to send 10 packet then how many total transmissions are required?

shahidcs asked in Computer Networks Apr 16

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Gate Test series
Q: Consider the Transmission of a 10000 bit frame on 10 Mbps channel with a propagation delay of 250 ms. The sender window size is 7 and probability of error in single frame is 0.001 then the channel utilization for go-back-N protocol (in percentage) is _________.

MonuKhan asked in Computer Networks Jan 16

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MADE EASY test series | Computer Networks
Can someone please suggest weather to go for 20.5 or 21 in these kind of problems in GATE? As logically 21 is correct, but mathematically 20.5 is correct. Both the answers can be reasoned correct and wrong, feels like “Umpire’s call” in DRS, cricket.

Souvik33 asked in Computer Networks Jan 3

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unacademy AIMT 2
In go back 5, if every 7th packet that is being transmitted is lost and if we have to send 10 packets, then how many transmissions are required____. I’m getting 15 but the given answer is 14

TusharKumar asked in Computer Networks Dec 22, 2022

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2 votes

1 answer

5

Solution is 2 or 3?
Should the solution for the above question be 2 or 3?

h4kr asked in Computer Networks Dec 9, 2022

by h4kr

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2 answers

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Sliding window, Go-Back-N protocol, All ack lost case
I understood that receiver will correctly discard the frames in GBN all ack lost case. But its given that its positive ack and hence receiver wont send ack for discarded frames.Wont the sender be sending the same frames again and again ... timeout as receiver will never send ack again? So how will the sender slide the window to the next frames?

fred20978 asked in Computer Networks Nov 8, 2022

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2 answers

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GATE CS Applied Course Test Series
In the GO back N ARQ sender is sending the 15 packets to the destination with a window size of 5.Assume every sixth packet while transmission is lost. How many transmissions will there be?

rsansiya111 asked in Computer Networks Nov 2, 2022

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In Go-back-N protocol with m=6, the sending machine is in the ready state with Sf=10 and Sn=15, An ACK with ACKNo =13 arrives, what are the next values of Sf, Sn and Rn?

nandini96686 asked in Computer Networks Sep 15, 2022

by nandini96686

366 views

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2 answers

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Applied Test Series
A link has a transmission speed of 500 × 10^6 bpsec. Assume acknowledgment has negligible transmission delay, and it's one way propagation delay is 2 sec. Also assumes that the processing delays at nodes are also negligible. If data packet size is 107 bits, then the efficiency of Go-Back-7 protocol is _______ (in %) [Correct upto two places of decimals].

LRU asked in Computer Networks Oct 13, 2021

by LRU

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Applied Test Series
In the GO back N ARQ sender is sending the 20 packets to the destination with a window size of 4. Every sixth packet is lost and after a packet loss sender is sending one dummy packet outside the window for ensuring everything is correct [ dummy packet is an outside packet not the part of the window]. How many number of transmissions will be there?

LRU asked in Computer Networks Oct 13, 2021

by LRU

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11

Kurose and Ross Edition 6 Exercise 3 Question R12 (Page No 286)
Visit the Go-Back-N Java applet at the companion Web site. Have the source send five packets, and then pause the animation before any of the five packets reach the destination. Then kill the first packet and ... destination and kill the first acknowledgment. Describe again what happens. Finally, try sending six packets. What happens?

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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2 votes

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Self doubt
In go back n arq, the reciever window size is 1 and the sender window size is let's suppose 3.Now if the sender sends the frames with sequence numbers in order 0,1,2 and the reciever sends cumulative acknowledgement with number 3 and now expects a frame ... order and sender must keep on time out and sending the frames again.plz explain how will this be resolved or am I missing something?

hitesh159 asked in Computer Networks Mar 23, 2019

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computer network
A Go-Back-5 ARQ scheme is employed on a 200 meters cable between two nodes A and B to send frames of size 10,000 bits with bit rate 1 Mbps and bit error probability of 10$^{-5}$. Headers and acknowledgements are 20 bytes each. The Speed of ... (except for the cable length), what is the maximum distance between the two nodes for which S&W will be as efficient as a GBN.

manisha11 asked in Computer Networks Feb 23, 2019

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2 votes

1 answer

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Made easy test series computer network gbn Sr sliding window protocol
Consider two computers A and B are connected through a network of 30 Mbps. Assume the distance between them is 3000km and the signal propagation speed is same as the speed of light and the packet size is 12 KB. What is the minimum number of bits ... -N and selective repeat protocol? A . 5 and 6 B. 6 and 7 C. 6 and 6 D. 7 and 8

Ram Swaroop asked in Computer Networks Jan 22, 2019

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Why we need to wait for ACK in sliding window protocol in this specific question
I was going through this question; The link A-R is instantaneous , but the R->B link transmits only 1 packet each second , one at a time . Assume A sends to B using sliding window protocol with window ... this wrong? Or I am wrong and sliding window protocol means Selective Repeat and it sends ACK for each frame?

Raj Singh 1 asked in Computer Networks Jan 12, 2019

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MadeEasy Test Series: Computer Networks -Sliding Window
I am unable to understand their explanation,can anyone explain it in a better way?

sripo asked in Computer Networks Jan 5, 2019

by sripo

413 views

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2 answers

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Madeeasy[CN-Flow control]
Consider two computers A and B are connected through a network of 30 Mbps.Assume the distance between them is 3000km and the signal propagation speed is same as the speed of light and the packet size is 12 KB. What is minimum number of bits required for window to achieve 100% utilization during GBN and SR protocol ?

jatin khachane 1 asked in Computer Networks Dec 18, 2018

by jatin khachane 1

915 views

3 votes

2 answers

18

MadeEasy Test Series: Computer Networks - Flow Control Methods
Assume 2 computers are connected via a network. The network uses Go-Back 7 sliding window protocol for maintaining flow control. It is observed that every 5th packet that has been sent through the network is lost. ... number of extra packets that has to be resent for transmitting 10 such packet through the network? With explanation.

Subham Nagar asked in Computer Networks Dec 17, 2018

by Subham Nagar

2.0k views

2 votes

2 answers

19

MadeEasy Test Series 2019: Computer Networks - Sliding Window
Assume 2 computers are connected via a network. The network uses GB-7 sliding window protocol for flow control.It is observed that every 5th packet that has been sent is lost. The number of extra packets needs to resend Number of total packets transmitted by sender for sending 10 packets .

jatin khachane 1 asked in Computer Networks Dec 15, 2018

by jatin khachane 1

2.9k views

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20

GBN Maximum possible data rate

junaid ahmad asked in Computer Networks Dec 8, 2018

by junaid ahmad

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sliding window protocol question on earth and lunar
A colony is set up on moon. The 10 Mbps link from the earth to the lunar colony measures about 242,000 miles. Assume that the signal propagation speed is 186,000 miles per second. Calculate the minimum round trip time for ... . SRP with window size 8 and negligible processing delay. Go Back-n with window size 64 and negligible processing delay.

John Doe asked in Computer Networks Nov 24, 2018

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made easy test series
answer given is 11. I am Getting 3

amitqy asked in Computer Networks Nov 16, 2018

by amitqy

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1 answer

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#CN What is the channel utilization for the go-back-N protocol with window size of 7 for the problem 3?

iarnav asked in Computer Networks Nov 8, 2018

by iarnav

1.6k views

1 vote

1 answer

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#CN Stop and Wait ARQ Numerical about finding efficency?
Consider the use of 10 K-bit size frames on a 10 Mbps satellite channel with 270 ms delay. What is the link utilization for stop-and-wait ARQ technique assuming P = 10-3? My doubt - In frame size 10 K-bit, what should you take value of K? i.e K ... / (10 Mbps) = 1 msec Hence, a = 270/1 = 270 Link utilization = 0.999/(1+2*270) ≈0.0018 =0.18%

iarnav asked in Computer Networks Nov 8, 2018

by iarnav

1.5k views

3 votes

1 answer

25

MadeEasy Test Series: Computer Networks - Sliding Window
Consider the GBN protocol with sender and receiver window size as 5.Suppose client sends data 0,1,2,3,4 and only data packet 2 is lost and all ACKs are lost. What will be the content of receiver and sender window. Before Senders ... . Sender: 23456 , Receiver : 01234 C. Sender: 23456 , Receiver : 23456 D. Sender: 01234 , Receiver : 23456

Na462 asked in Computer Networks Sep 15, 2018

by Na462

2.5k views

1 vote

4 answers

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Go back n ARQ
A 20 Kbps Satellite link has a propagation delay of 400 ms. The transmitter employs the "go back n ARQ" scheme with n set to 10. Assuming that each frame is 100 bytes long, what is the efficiency of channel? (with 2 decimal places)

Mk Utkarsh asked in Computer Networks Sep 7, 2018

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2 votes

3 answers

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Sliding window protocol
Station A needs to send a message consisting of 10 packets to station B using a sliding window of size 4. All packets are ready and can be transferred immediately.Selective repeat and GBN are used at 2 different times and every 5th packet get lost for ... of transmissions that A has to make in selective repeat and GBN respectively to ensure safe delivery to B. Then x+y= ?

Sumit Singh Chauhan asked in Computer Networks Aug 2, 2018

by Sumit Singh Chauhan

5.1k views

2 votes

3 answers

28

Sliding window protocol
A channel has bit rate of $1 \hspace{0.1cm} Mbps$ and propagation delay of $270 \hspace{0.1cm} msec$ .Frame size is of $125 \hspace{0.1cm} bytes$ . Acknowledgement is always piggibacked onto data frames .Four bit sequence no. Is used .ignore header size,then what is maximum achievable channel utilization for GO-BACK-N? $1.48\%$ $0.18\%$ $2.95\%$ $2.78\%$

Prateek Raghuvanshi asked in Computer Networks May 31, 2018

by Prateek Raghuvanshi

1.5k views

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Recent questions tagged go-back-n