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1. can be hardware or software based

2. work by using a set of rules that filter and reject unwanted or suspicious network packets arriving from a remote network

3. usually exist by sitting between an external network and an internal network

4. a desktop computer can also host its own firewall service, blocking network data travelling in and out

   • additional options may stop certain applications from sending and/or receiving certain packets of network data.

5. Firewalls form the first line of defence in protecting digital systems from external threats such as cyberattacks and viruses

6. Access Control List - creating a set of rules that determine which packets of data are sent and received

7. keeping an ACL regularly updated is a good way to manage threats to data.

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