Computer Science

a seven-layer model that describes how different computer systems can communicate over a network

when data is packaged with additional information as it moves down through the layers of the network model

when data is received and unpacked by a device as it moves up through the layers of the network model

Network models

Internet fundamentals

How data travels across the internet

Protocols

Hosting services

Web technologies

Threats to networks

Network security

In this unit pupils will explore how data travels across the internet. They will explore how protocols define communication between devices and the purpose of common network protocols. They will investigate the risks to networks and the methods that can be used to protect a network.

The internet and web technologies

to provide a conceptual framework for network communication

What is the main purpose of the OSI model?

What is the process called where data is packaged with extra information as it moves down through the layers of a network model?

What is the process called where extra information is removed from data as it is received?

Order these steps for data transmission using network models:

What is a protocol in computer networking?

What usually assigns IP addresses on a local network?

Which of these is an example of a protocol?

the device uses a protocol to communicate

Order these steps for a device joining a local network:

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