What is the function of a firewall in a computer network?

• A. To create backups of data
• B. To control incoming and outgoing network traffic
• C. To enhance internet speed
• D. To connect multiple devices

Answer: (B)

A firewall primarily functions to control the incoming and outgoing network traffic. It acts as a security barrier that monitors and manages data packets entering or leaving the network based on predetermined security rules. By doing so, it helps prevent unauthorized access to or from a private network, ensuring that only legitimate traffic is allowed through while blocking any potential threats such as malware, hackers, or other malicious activities. Firewalls can be hardware-based, software-based, or a combination of both, and they play a crucial role in maintaining the integrity and security of networked systems.

The other options listed do not accurately describe the primary function of a firewall. Creating backups of data is typically the role of backup software or systems, enhancing internet speed relates to network optimization and is not a direct function of a firewall, and connecting multiple devices is a basic networking function handled by routers and switches rather than a security measure provided by a firewall.