Go-Back-N ARQ

Computer Networks: Go-Back-N ARQ in Computer Networks
Topics Discussed:
1) Difference between Stop-and-Wait ARQ Protocol and Sliding window protocol.
2) Drawbacks Stop-and-Wait ARQ Protocol.
3) Go-Back-N ARQ protocol
4) Working of Go-Back-N ARQ.
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#ComputerNetworksByNeso #ComputerNetwork #GoBackNARQ #SlidingWindowProtocol

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Acknowledgements

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Thanks for the video. You should also include timers like start timer, restart and stop timers according to packets sent/Recived or lost, the timer concept i also important to understand.

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[@mathuca7731]

It may be important to add, that if ACK 2 is lost but the sender still recieves ACK 3, he knows that the receiver actually recieved PCKT 2 even if he didnt receive the acknowledgement for it. So he will not resend PCKT 2.

[@ahlahous8128]

that's would be right if it's explicitly mentioned that we are using " Including acknowledgement " : which means we acknowledge all previous frames the sender has received and not every frame individually. For example, if ACK n is received by the sender, it means that all frames ( from 0 to n-1 ) are marked as received. Even though it's not the case by one of the frame ( frame get lost ).

[@charan2604]

I guess, As soon as the time's out(in waiting for acknowledgement of Frame2), the next frames i.e., Frame3,4,5 which were already sent are discarded ..So, the receiver will not receive any frames and thereby it can't acknowledge.

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[@Nerdifull]

Great short lesson, you were very clear and easy to understand. However, I'd like to point out that in the example you provided there's an error: GbN uses cumulative ACKs, meaning if ACK (packet 2) is never received, but ACK3 is received, we assume that ACK2 was lost but the packet itself was received.

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[@user-nc4sy3ly7r]

🎯 Key Takeaways for quick navigation:
00:00 📚 Introduction to Go-Back-N ARQ
01:20 🔄 Go-Back-N ARQ Basics
03:38 🧮 Sequence Number Calculation
05:42 🎬 Working of Go-Back-N ARQ
Made with HARPA AI

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xavier

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Sounds good huh?

[@rachnarachna6413]

Thnku sir

[@wasimzaman2453]

as you said that the frame 4 and 5 are discarded by the receiver because the frame 2 was lost, after this frame 2, the frame 3 was also sent, what about that ? is that also be discarded by the receiver ?

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thanks

[@coxixx]

would you explain about "number of transmitted frames to successfully transmit one frame"

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please upload transport and other layers

[@parthtiwari8152]

i think the receiver will also discard the 2and 3 because they are already there as the ACK is lost but the receiver had that frame 2 and 3

[@hossainbinsayeed568]

what about the frame 3, is it discard or not. Because frame 3 still in the window as well as sender side. So, only 4,5 are discarded or 3,4,5.

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wonderfull

[@kaleemullahharis8976]

at 5:10; what ll b sequence number if we have the window size n=3,, which can not be represented in power of 2?? In this case what should be added or subtracted for the sequence number.