What is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules?

What is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules?

• A. Firewall
• B. Proxy
• C. Router
• D. IPS

Answer: (A)

A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It sits at the boundary between trusted and untrusted networks and enforces policies that decide which traffic is allowed or blocked, such as permitting web traffic from authorized hosts while blocking suspicious connections. This rule-based filtering is what gives it its protective role, helping prevent unauthorized access and common threats. A proxy might filter content and act as an intermediary for requests, but its primary job is not to enforce boundary-wide traffic rules; it focuses on handling requests on behalf of clients, often with caching or anonymity features. A router’s main function is to move data packets between networks, focusing on route decisions rather than enforcing security policy at the traffic boundary. An intrusion prevention system analyzes traffic for suspicious behavior and can block threats, but its core purpose is detection and threat mitigation rather than applying broad, preset access rules to all traffic.

A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It sits at the boundary between trusted and untrusted networks and enforces policies that decide which traffic is allowed or blocked, such as permitting web traffic from authorized hosts while blocking suspicious connections. This rule-based filtering is what gives it its protective role, helping prevent unauthorized access and common threats.

A proxy might filter content and act as an intermediary for requests, but its primary job is not to enforce boundary-wide traffic rules; it focuses on handling requests on behalf of clients, often with caching or anonymity features. A router’s main function is to move data packets between networks, focusing on route decisions rather than enforcing security policy at the traffic boundary. An intrusion prevention system analyzes traffic for suspicious behavior and can block threats, but its core purpose is detection and threat mitigation rather than applying broad, preset access rules to all traffic.