Computer Hacking Forensic Investigator (CHFI v10) — Question 62

Software firewalls work at which layer of the OSI model?

Answer options

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

Correct answer: B

Explanation

The correct answer is B, as software firewalls primarily function at the Network layer of the OSI model by filtering incoming and outgoing traffic based on IP addresses and protocols. Options A, C, and D refer to other layers where firewalls do not primarily operate, focusing instead on application-level processes, transport protocols, and data link functionalities.