Preview lessons, content and tests

Computer Science & Programming solved. All in one platform.

1. To trial the platform and take tests, please take a few seconds to SIGN UP and SET UP FREE.
2. Searching for something specific? See our text overview of all tests. Scroll right for levels, and lists.

Join 36000+ teachers and students using TTIO.

Layers in the internet? These layers refer to a division of network functionality. They aren't actual physical things inside a computer or network, but rather think of them as tools used by developers and computer scientists to help us understand how protocols interact with one another.

A layer is a group of protocols that all serve a similar function. For example since UDP and TCP do the same kind of job in two different ways, they would be in the same layer. Think of these layers as a means of categorising protocols, of making them easier to think about and work with.

Video with explanation

Four Layer Model - Video (real world example)

Additional Reading