Osi Model Questions Medium
In the OSI Model, data de-encapsulation refers to the process of removing the headers and trailers added at each layer of the model as data is transmitted from the source to the destination.
The process of data de-encapsulation starts at the receiving end of the communication. As the data travels through the layers of the OSI Model, each layer adds its own header and trailer to the original data. These headers and trailers contain control information and additional data necessary for the proper transmission and delivery of the data.
When the data reaches the destination, the de-encapsulation process begins. The receiving device starts by examining the physical layer header and trailer, which contain information about the physical transmission medium, such as the source and destination MAC addresses. The physical layer removes this header and trailer, exposing the data and passing it to the data link layer.
The data link layer then examines its own header and trailer, which include information such as the source and destination network addresses. It removes this layer's header and trailer, exposing the data and passing it to the network layer.
The network layer then examines its header, which contains information such as the source and destination IP addresses. It removes this layer's header, exposing the data and passing it to the transport layer.
The transport layer examines its header, which includes information such as the source and destination port numbers. It removes this layer's header, exposing the data and passing it to the session layer.
The session layer examines its header, which contains information about the session establishment and termination. It removes this layer's header, exposing the data and passing it to the presentation layer.
The presentation layer examines its header, which includes information about data encryption and compression. It removes this layer's header, exposing the data and passing it to the application layer.
Finally, the application layer receives the data without any headers or trailers, making it ready for the application to process and utilize.
In summary, the process of data de-encapsulation in the OSI Model involves sequentially removing the headers and trailers added at each layer, starting from the physical layer and ending at the application layer, until the original data is exposed and ready for use.