What is the main purpose of a 'firewall' in a computer network or system?

A) To speed up internet connection

B) To encrypt all outgoing data

C) To monitor and control incoming and outgoing network traffic based on security rules

D) To back up user files automatically

Explanation

A firewall acts as a security barrier, examining network traffic and blocking unauthorized access or suspicious data packets based on predefined security rules, thereby protecting a network or computer from external threats.

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