Firewalls
"Restricts unauthorised access to a network by using a set of rules."
A firewall is special software that protects a network from unwanted visitors. It acts like a security guard, checking every piece of data trying to enter or leave.
It uses a set of rules to decide:
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What data is safe to let through.
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What data should be blocked.
This helps to restrict unauthorised access to the network — meaning only trusted data can get in or out.
Key Point:
A firewall restricts unauthorised access to a network.
It does this using a set of rules.
