Which network security tool acts as a barrier between a trusted internal network and an untrusted external network (like the Internet) to monitor and filter incoming and outgoing traffic?

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A Router
B Modem
C Firewall
D Network Switch

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Answer: C. Firewall

Answer Explanation: C. A firewall can be software or hardware. It acts as a shield that inspects data packets entering or leaving a network and blocks them based on a set of predefined security rules.

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Which network security tool acts as a barrier between a trusted internal network and an untrusted external network (like the Internet) to monitor and filter incoming and outgoing traffic?

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