A computer network is a group of computer systems and other hardware devices that are connected and able to communicate and exchange data through communication channels such as cable or wireless media.

Identify different types of networks.

Outline the importance of standards in the construction of networks.

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

Open Systems Interconnection (OSI) model

Identify the technologies required to provide a VPN.

Evaluate the use of a VPN.

Define the terms: protocol, data packet.

Explain why protocols are necessary.

Explain why the speed of data transmission across a network can vary

Explain why compression of data is often necessary when transmitting across a network.

Outline the characteristics of different transmission media.

Metal Conductor

Fibre optic

Wireless

Explain how data is transmitted by packet switching.                  

Outline the advantages and disadvantages of wireless networks.

Describe the hardware and software components of a wireless network.

Describe the different methods of network security

Evaluate the advantages and disadvantages of each method of network security.

*Network topologies