Computer Science for IGCSE & O level - Data Transmission (Section 6 - No. 17)
What does the term 'firewall' primarily do in terms of network security?
Encrypts all network traffic.
Filters network traffic based on predefined rules.
Connects different networks together.
Translates network addresses.
Explanation
A firewall filters network traffic based on security rules, allowing or blocking data packets.
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