What does a firewall do?

• A. It monitors and controls incoming and outgoing network traffic based on security rules
• B. It accelerates internet connection speeds
• C. It backs up data automatically
• D. It maintains a log of user activities

Answer: (A)

A firewall acts as a security barrier between a trusted internal network and untrusted external networks, such as the internet. Its primary function is to monitor and control incoming and outgoing network traffic based on predetermined security rules. By doing so, it can block or allow traffic based on IP addresses, protocols, and port numbers, providing a protective measure against unauthorized access and threats such as viruses and hackers.

The significance of this functionality cannot be overstated, as firewalls help organizations safeguard sensitive data and maintain the integrity of their networks. They effectively filter out potentially harmful traffic while allowing safe communication to proceed, making them essential for network security.

Other options may describe functionalities related to computers or networks, such as improving speed, backing up data, or maintaining user activity logs. However, these do not pertain to the core purpose of a firewall, which is focused solely on traffic control and security enforcement.