When sending data across a network, the data that is being sent needs to be packaged up and delivered to the correct device. A lot like sending a letter.
To understand this, we use the TCP/IP model to divide up the process of packing up and unpacking data.
The TCP/IP model is divided into four layers:
- Data Link
When sending data, the layers are followed from top to bottom. This is then reversed to unpack the data when it it received.
The Application Layer
This layer is about making data readable by humans (or taking readable data & translating it into something that can be transmitted). Protocols such as HTTP, and FTP exist at this layer.