What is a common use for a firewall?

• A. To optimize internet speed
• B. To prevent unauthorized access to or from a private network
• C. To backup data automatically
• D. To manage network resources

Answer: (B)

A firewall serves the critical function of preventing unauthorized access to or from a private network. Its primary role is to monitor and control incoming and outgoing network traffic based on predetermined security rules. By doing so, firewalls protect internal networks from malicious attacks, unauthorized users, and other security threats, ensuring that sensitive data remains secure.

In addition to protecting against external threats, firewalls also manage access to the internal network, allowing only trusted traffic to pass through. This helps maintain the integrity and confidentiality of the data within the network, making firewalls a fundamental component of network security for both individual users and organizations.