Describe the role of firewalls.

• A firewall protects against suspicious access to a computer from a network. When an external computer tries to access a computer, the firewall decides if the external computers access should be granted or denied.

 

Describe the use made of encryption in electronic communications.

• Encryption encodes the information so that if it is intercepted then they would not be able to make sense of it. It can only be understood by the sender and received.