The window size of the receiver is 1 as the data link layer only require the frame which it has to send next to the network layer. A site about programming languages, Technical topics And for codes too.Design 2 bit synchronous up down counter using T flip flop? In other words, it's easier to receive a short message than a longer message. In this protocol, sender sends n frames at a time and wait for acknowledgment of packets received in particular order. Go-Back-N protocol and Selective-Repeat protocol are sliding window protocols used to deal with errors occurred during data transmission. The sender window size is equal to ‘w’. In selective repeat protocol, the retransmitted framed is received out of sequence. Why is this so, and how? The Transmission Control Protocol uses a variant of Go-Back-N ARQ to ensure reliable transmission of data over the Internet Protocol, which does not provide guaranteed delivery of packets; with Selective Acknowledgement (SACK) extension, it may also use Selective Repeat ARQ. If acknowledgment is not received then entire frames are retransmitted again.Selective Repeat is also a protocol for flow control mechanism.
The frames that are received after the damaged frame are not be acknowledged until the damaged frame has been replaced.As in a selective repeat protocol, a frame can be received out of order and further they are sorted to maintain a proper sequence of the frames. Therefore, standard ARQ techniques involving variable length messages have increased difficulty delivering longer messages, as each repeat is the full length. The “selective repeat protocol” retransmits only that frame which is damaged or lost.Go-Back-N protocol is a sliding window protocol. The receiver process keeps track of the sequence number of the earliest frame it has not received, and sends that number with every The size of the sending and receiving windows must be equal, and half the maximum sequence number (assuming that sequence numbers are numbered from 0 to In most channel models with variable length messages, the probability of error-free reception diminishes in inverse proportion with increasing message length.
Selective repeat protocol, also called Selective Repeat ARQ (Automatic Repeat reQuest), is a data link layer protocol that uses sliding window method for reliable delivery of data frames. Upon receipt of a Selective Repeat control PDU (by the local node), the transmitter sends a single PDU from its buffer of unacknowledged PDUs. If the last transmitted frame is lost then the receiver does not respond and this silence is a negative acknowledgement for the sender.If the sender does not receive any ACK or the ACK is lost or damaged in between the transmission. However, if selective repeat is to be used, the requirement that n t +n r ≤ 8 must be maintained; if w r is increased to 3, w t must be decreased to 6. If acknowledgment is not received then frame/packet is retransmitted.GoBackN is also a protocol for flow control mechanism. If acknowledgment is not received then lost packets are transmitted again which is based on receiver acknowledgment. This content contains nine difference between go-back-n protocol and selective repeat protocol. Thanks so muchExplained in easy language easily understood thanks.The explanation was perfect. Operation of Selective Repeat. This protocol is almost like Go-Back-N ARQ protocol, or we can say that it is a modified form of GBN ARQ, the part where it differs is that here buffers are used and both receiver & sender maintain a window of size. However, here only the erroneous or lost frames are retransmitted, while the good frames are received and buffered. Selective Repeat is a connection oriented protocol in which both transmitter and receiver have a window of sequence numbers. The sender identifies the loss of ACK with the help of a timer.The ACK number, like NAK (negative acknowledgement) number, shows the number of the frame, that receiver expects to be the next in sequence. The main difference between them is, Go-Back-N protocol retransmits all the frames starting from the damaged or corrupted frame, whereas Selective Repeat protocol only retransmits frames that are damaged.
–Selective Repeat. Once acknowledged, sender sends another frame to the receiver.
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