What is the primary purpose of a firewall in network security?

• A. To monitor and control incoming and outgoing network traffic based on security rules, protecting the internal network from unauthorized access.
• B. To encrypt all data transmissions
• C. To block all external connections
• D. To manage user passwords

Answer: (A)

Firewalls regulate traffic at the network boundary, monitoring incoming and outgoing data and enforcing security rules about what is allowed to pass. By inspecting packets and connection states, they let legitimate services (like a web server or email) through while blocking traffic that appears unauthorized or harmful. This helps protect internal systems from intrusions and reduces the risk of attacks. Encryption is a separate function handled by cryptographic protocols, and a firewall doesn’t manage user passwords or automatically block all external connections; instead it applies defined rules to determine which traffic is permitted. Firewalls can be hardware or software and can operate at different depths, from basic packet filtering to more advanced application-layer inspection, forming a critical first line of defense in network security.