Define the term computer network - AQA - GCSE Computer Science - Question 13 - 2021 - Paper 1

A firewall acts as a barrier between a computer network and external connections/devices. It inspects incoming and outgoing packets of data to determine if they may be malicious. Additionally, a firewall checks if packets are allowed or disallowed by firewall settings, hence restricting certain services or ports.

Firewalls inspect incoming and outgoing traffic to identify and block malicious data packets. They provide an additional layer of security by evaluating data against established criteria, thereby controlling access to the network.

I choose Authentication.

Authentication involves taking one or more pieces of data specific to the user. It compares this information against stored credentials and only allows access if the system recognizes them as valid.

The correct statements are:

• A protocol is a set of rules.
• All protocols transmit data securely.