What are network protocols and how does data encapsulation work?
Network protocols are formalized rules and standards that define the message format and the order of data exchange between various devices on a network. Thanks to unified protocols, computers from different manufacturers running completely different operating systems can successfully understand each other and transmit information without errors.
The process of data transmission over a network is built on the fundamental principle of encapsulation. When a user sends a message through an application, this message begins its journey from top to bottom through the layers of the network model. At each new level, its own service information in the form of headers or trailers is added to the original data, describing the processing rules at that stage.
A clear algorithm of encapsulation looks as follows:
On the receiver's side, a mirror process called decapsulation takes place. The device receives the physical signal, recognizes it as a frame, removes the data link header, then examines the network header, discards it, and moves up to the transport layer. In the very end, the application receives clean data in its original form, as if there was no complex packaging along the way at all.