The sliding window is a technique for sending multiple frames at a time. It controls the data packets between the two devices where reliable and gradual delivery of data frames is needed. It is also used in TCP (Transmission Control Protocol).
In this technique, each frame has sent from the sequence number. The sequence numbers are used to find the missing data in the receiver end. The purpose of the sliding window technique is to avoid duplicate data, so it uses the sequence number.
Types of Sliding Window Protocol: Sliding window protocol has two types
1.Go-Back-N ARQ
2.Selective Repeat ARQ
1.Go-Back-N ARQ
The Go-Back-N Automatic Repeat Request protocol is also known as the Go-Back-N ARQ protocol. A sliding window method finds use in this data link layer protocol. In the event of corruption or loss of frames, all subsequent frames must be sent again.
In the event of transmission of a corrupted frame, the receiver cancels it. The receiver does not accept a corrupted frame. The sender sends the correct frame again when the timer expires.
d. Accordingly, the receiver sends the acknowledgement for the 1st frame, and upon receiving that, the sender slides the window again and sends the next frame. This process keeps on happening until all the frames are sent successfully.
Gate Question :
2.Selective Repeat ARQ
Selective Repeat ARQ (Selective Repeat Automatic Repeat Request) is another name for Selective Repeat ARQ. A sliding window method is used in this data link layer protocol. If the frame has fewer errors, Go-Back-N ARQ works well. However, if the frame contains a lot of errors, sending the frames again will result in a lot of bandwidth loss. As a result, we employ the Selective Repeat ARQ method.
The size of the sender window is always equal to the size of the receiver window in this protocol. The sliding window’s size is always greater than 1.
Difference between Stop and Wait, Go-Back-N, and Selective Repeat
No comments:
Post a Comment