Computer Science for IGCSE & O level - Data Transmission (Section 4 - No. 3)
Which of the following best describes the concept of 'firewall'?
A method to encrypt data.
A device that filters network traffic.
A type of network cable.
A way to improve data speed.
ব্যাখ্যা
A firewall is a security system that monitors and controls network traffic based on security rules.