3.1.3 Describe how communication over networks is broken down into different layers.

The communication over networks is broken into seven layers.

7. Application layer - Presents the information in a user-friendly way (HTML)
6. Presentation layer - Converts data from binary format to user-friendly format or vice versa
5. Session layer - Creates a bridge between 2 computers by checking the presence of both devices
4. Transport layer - Decides the way how the data will be transported (TCP- transmission control protocol)
3. Network layer - Checks the presence of the IP address
2. Data link layer - Checks the physical address of the device (MAC)
1. Physical layer - Checks the presence of cables

If data is sent the list goes from 7 to 1. If data is received the list goes from 1 to 7.