What is NOT a function of a firewall?

• A. Monitoring network traffic
• B. Encrypting data
• C. Blocking unauthorized access
• D. Logging firewall activity

Answer: (B)

A firewall is primarily designed to monitor and control incoming and outgoing network traffic based on predetermined security rules. Its main functions include blocking unauthorized access to or from a network, monitoring network traffic for suspicious activity, and logging firewall activity for auditing and analysis purposes. While encryption is an important security measure, it is not a function of a firewall. Encryption generally occurs at a different layer of network security, often handled by other mechanisms or services designed specifically for securing data in transit or at rest, rather than by firewalls themselves. Thus, understanding the functions of a firewall helps clarify that encryption is outside its intended scope.