On a network a firewall

Question

BlackTom AI · Accepted Answer

A firewall inspects and filters network traffic, so the correct choice is d. monitors data packets coming through the internet connection and blocks unusual data.

1) Relevant knowledge points and concepts
- Firewall: a network security device (hardware or software) that examines incoming and outgoing data packets and permits or blocks them according to configured security rules.
- Packet inspection: firewalls can perform stateful or deep packet inspection to identify unusual, unauthorized, or malicious traffic patterns.
- Distinction from other tools: antivirus scans files on a device for malware; access control (permissions/ACLs) restricts file access; employee monitoring is a separate activity (monitoring software or policies).

2) Step-by-step reasoning
- The options describe different security or administrative functions. Match each to the typical function of a firewall.
- Option d explicitly states packet monitoring and blocking of unusual data, which aligns with packet filtering and intrusion prevention capabilities of firewalls.
- Options a, b, and c describe functions performed by other systems (employee monitoring tools, file permission systems, and antivirus respectively).

3) Intermediate steps (concept checks)
- Firewalls are placed at network boundaries to monitor traffic coming through the internet connection.
- If traffic matches a rule indicating malicious behavior or anomaly, the firewall blocks or drops those packets.
- Firewalls can also log and alert on such events, supporting further investigation.

4) Why the correct answer is correct
- “Monitors data packets… and blocks unusual data” precisely describes how firewalls enforce network security by examining packet headers and payloads (depending on type) and applying rules to allow or deny traffic.

5) Why other options are incorrect
- a. monitors employees to make sure they are doing work — this is employee monitoring/software, not a firewall’s role.
- b. restricts access to files on a network — file access control is handled by file servers/permissions, not the firewall.
- c. scans a device for malware — malware scanning is performed by antivirus/endpoint protection, not primarily by a firewall.

6) Conclusion
This confirms the correct answer is d. monitors data packets coming through the internet connection and blocks unusual data.

On a network a firewallSingle choice

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