What is the purpose of a firewall in cybersecurity?

• A. To increase internet browsing speed
• B. To protect networks from unauthorized access
• C. To store data securely
• D. To enhance software performance

Answer: (B)

The purpose of a firewall in cybersecurity is to protect networks from unauthorized access. A firewall acts as a barrier between a trusted internal network and untrusted external networks, such as the internet. By monitoring and controlling incoming and outgoing network traffic based on predetermined security rules, a firewall helps to prevent unauthorized users or malicious attacks from disrupting or breaching the network's security. This is essential in safeguarding sensitive data and maintaining the integrity of the network.

While other options might relate to aspects of network or computer functionality, they do not accurately represent the primary function of a firewall. Increasing internet browsing speed, storing data securely, or enhancing software performance are not the main roles of a firewall. Instead, its core responsibility is ensuring that only legitimate traffic is allowed through while blocking potentially harmful intrusions.