Which one of the following describes how a firewall protects a local area network (LAN) connected to the internet?

Question

BlackTom AI · Accepted Answer

The question asks which statement best describes how a firewall protects a LAN connected to the internet.
Option a: 'A firewall is used to define user permissions and user access to shared files.' This describes access control and file permissions, typically handled by a file server or access control system, not by a firewall.
Option b: 'A firewall scans the LAN to find computer viruses.' Firewalls are not primarily antivirus scanners; they filter traffic. Virus scanning is usually done by antivirus software or dedicated security appliances, not by basic firewall traffic filtering.
Option c: 'A firewall scans the LAN to remove internet worms.' While malware containment is a security goal, standard firewalls do not actively remove worms from inside the LAN. Removal and remediation are performed by endpoint protection and incident response tools, not by the firewall’s routine filtering.
Option d: 'A firewall blocks suspicious data from entering the LAN.' This captures the core function: the firewall inspects incoming traffic from the internet and blocks data that appears malicious or unapproved based on rules, thereby protecting the internal network from external threats.
Thus, the reasoning aligns with the firewall’s role as a gatekeeper that filters external traffic to prevent potentially harmful data from reaching the LAN.

Which one of the following describes how a firewall protects a local area network (LAN) connected to the internet?单项选择题

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