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Go-Back-N ARQ is a specific instance of the Automatic Repeat-reQuest (ARQ) Protocol, in which the sending process continues to send a number of frames specified by a window size even without receiving an ACK packet from the receiver. The receiver process keeps track of sequence number of the next frame it expects to receive, and sends that number with every ACK it sends. The receiver will ignore any frame that does not have the exact sequence number it expects -- whether that frame is a "past" duplicate of a frame it has already ACK'ed, or whether that frame is a "future" frame past the lost packet it is waiting for. Once the sender has sent all of the frames in its window, it will detect that all of the frames since the first lost frame are outstanding, and will go back to sequence number of the last ACK it received from the receiver process and fill its window starting with that frame and continue the process over again.
A nice java applet can be found here:
http://media.pearsoncmg.com/aw/aw_kurose_network_2/applets/go-back-n/go-back-n.html
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∙ 15y ago
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Which protocol comes under noiseless channel?
stop and wait, go-back-n
What are the advantages and disadvantages of the Selective Repeat protocol in comparison with Go-Back-N?
Using the Go Back N protocol for error control means that if a timeout occurs, then all unacknowledged packets are resent, where with selective repeat, only those packets that were unacknowledged. This allows the Go Back N to use cumulative acknowledgements, creating a faster data flow, but this also means that in the case of an interruption, the system is slower to recognize this and then time is lost for the retransmission since the last cumulative ack.
Differences between go back n arq and selective repeat arq protocol?
1.Selective repeat ARQ is efficient for noisy links and Go Back N ARQ is inefficient for noisy link. 2.Selective Repeat ARQ is complicated whether Go Back N ARQ is less complicated than Selective repeat ARQ. 3.in Sender and receiver Window Size is 2^(m-1) and in Go Back N ARQ Sender Window Size is 2^(m)-1 and receiver window size is 1.
Will n protocol work with g protocol?
No. But if the wireless router is N, then it should downgrade to G when needed. It's automatic but the speed and signal is not as good.
Forms of network access protocol?
n/y access protocol means say in arp process when an ip has a data and it needs to sent it, it must inform network access protocol such as ethernet and token ring of the destination hardware add on the local n/w.
Does n protocol work backwards compatible?
Sort of. Almost all Wireless N routers support the G protocol aswell, so will be compatible with these devices. Whether they benefit from the extra range, I do not know.
What are the advantages and disadvantages of onebit sliding window protocol?
Efficiency bandwith onebit sliding window protocol goback N selective repeat
Source code for n dimensional matrix operations?
See Numpy (a Python library for general N-dimensional matrix operations): http://numpy.org/
Explain the DML operations possible with Asp.net applications?
n
Stop n wait protocol is associated with which layer?
Data link layer of the OSI model..
Can you go back to reg motor oil after using synthetics?
N ot recommended
Do you capitalize European Theatre of Operations?
Yes, because it is a propernou n.
