![]() The features and working of this protocol are explained below: In SR. ![]() ![]() In SRP, the sender's window size starts at 0 and it grows to some predefined maximum. In the selective repeat protocol, both the sender and the receiver maintain a window of outstanding and acceptable sequence numbers. And, in RMP - the reliable multicast protocol - we will show how NACKs can reduce the number of control. Selective Repeat protocol or SR protocol is an implementation of a sliding window protocol. The selective repeat protocol is an implementation of the sliding window protocol. This can be a problem if the network has limited buffering capacity.įinally, the SRP can increase delay since the sender needs to wait for an acknowledgment for each packet before transmitting the next one. selective repeat protocols to reduce delays. As a result, it can increase network traffic.įurthermore, it requires more buffering on both the sender and receiver sides to store the packets that are not yet acknowledged. It uses two windows of equal size: a sending. Here, only the erroneous or lost frames are retransmitted, while the good frames are received and buffered. Therefore it requires more processing power and memory resources.Īdditionally, the SRP requires more overhead since it uses selective acknowledgments (SACKs) to notify the sender about lost or out-of-order packets. 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. The selective repeat protocol retransmits only that frame which is damaged or lost. If this window becomes full, the protocol is blocked until an acknowledgement is received for the earliest outstanding message. The protocol has a maximum number of messages that can be sent without acknowledgement. It’s more complex compared to other error control protocols. Selective repeat is a connection oriented protocol in which both transmitter and receiver have a window of sequence numbers. In selective repeat protocol, the window size must be less than or equal to half the size of the sequence number space for the SR protocol. This allows the sender to know exactly which packets need to be retransmitted.įurthermore, the SRP can reduce delay since the receiver can immediately start processing the received packets, even if some packets are still missing.įinally, the SRP can achieve higher throughput compared to other protocols like Go-Back-N, especially when the network has a high error rate or high bandwidth-delay product.ĭespite its advantages, the SRP also has some limitations and disadvantages. In the SRP, the receiver sends selective acknowledgments (SACKs) for packets received out of order or lost.
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