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

• A. To enhance system performance
• B. To protect against unauthorized access
• C. To transfer data packets
• D. To create network protocols

Answer: (B)

The role of a firewall in a computer network is fundamentally about protection against unauthorized access. Firewalls serve as a security barrier between an internal network and external sources, such as the internet. They monitor incoming and outgoing network traffic and determine whether to allow or block specific traffic based on predetermined security rules.

By filtering data packets, firewalls effectively create a protective layer around sensitive systems and information, helping to prevent unauthorized users and malicious attacks, such as hacking attempts or malware infections. This capability is crucial in maintaining the integrity, confidentiality, and availability of data within a network.

While enhancing system performance, transferring data packets, and creating network protocols are important aspects of networking and computing, they do not specifically encapsulate the primary function of a firewall, which is centered on network security.