Computer Hacking Forensic Investigator (CHFI) — Question 14

Software firewalls work at which layer of the OSI model?

Answer options

• A. Application
• B. Network
• C. Transport
• D. Data Link

Correct answer: D

Explanation

Software firewalls primarily function at the Data Link layer of the OSI model, where they monitor and control incoming and outgoing network traffic. The other options, such as Application, Network, and Transport layers, are not where software firewalls typically perform their operations, as they focus more on packet filtering and access control which is characteristic of the Data Link layer.