What is OSI Model?
The OSI (Open Systems Interconnection) model is a way to think about how information moves through a network. It breaks the process of sending data over a network into seven layers, each of which has a different job and set of responsibilities. The OSI model has seven layers, which are:
Physical Layer: This layer is in charge of the cables and connectors that connect the devices on the network.
Data Link Layer: This layer is in charge of making sure that devices on the network can talk to each other reliably and taking care of problems like finding and fixing errors.
Network Layer: This layer is in charge of sending data between devices on the network. It does this by figuring out the best route for the data to take.
Transport Layer: This layer is in charge of delivering data reliably and in the right order.
Session Layer: This layer is in charge of setting up, keeping, and ending connections between network devices.
Presentation Layer: This layer is in charge of putting data into a format that the application layer can understand.
Application Layer: This layer is in charge of connecting the network to the application that is using the network.
The OSI model is used as a reference model for network communication protocols like TCP/IP. It gives a standard way to understand how data is sent over a network. It helps make communication easy and modular, and it lets different layers be built and maintained without having to work together.