The data link is the second layer of the OSI model which is used for the transmission of the error-free frames from one node to the other node. Now, let us discuss the data link layer briefly so that we can get a better understanding of the Selective Repeat ARQ protocol as it is one of the most widely used protocols of the data link layer to control errors. The data link layer is one of the seven layers of the OSI model. The OSI model is a 7-layered model so it is also known as a 7-layered architecture model. It is a conceptual reference model that describes the entire flow of information from one computer to the other computer. The OSI model stands for Open Systems Interconnection model.

What is Sliding Window Protocol?īefore learning about the sliding window protocol, let us first learn about computer networks, the OSI model, and the data link layer (as the Sliding Window Protocol is related to the data link layer).Ī computer network is a set of devices (computers) connected to exchange information and resources such as files etc.

The working of the sliding window protocol.Įach of the topics is explained clearly with diagrams and examples wherever necessary.

What are the types of sliding window protocol?.

Introduction to Sliding Window Protocol.

There are two types of sliding window protocols namely - Go-Back-N ARQ, and Selective Repeat ARQ.

The ACK lets the sender know that a particular frame is received by the receiver correctly. When the receiver receives the frame, it sends back an ACK (acknowledgment) to the sender. The sequence number also helps the receiver identify the loss of damaged packets. The sender associates a sequence number to the data frames so that the receiver can use this sequence number to arrange the frames in order if any frame was re-transmitted. The sliding window protocol uses a mechanism of sequence numbers. Using the sliding window protocol, the sender can send multiple frames at a time. The sliding window protocol is a data link layer protocol that is useful in the sequential and reliable delivery of the data frames.

Arq protocol