What is the function of a firewall in computer security?

• A. To store data securely
• B. To prevent unauthorized access to or from a network
• C. To increase internet speed
• D. To manage server connections

Answer: (B)

A firewall plays a crucial role in computer security by acting as a 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 helps prevent unauthorized access to or from the network, thus protecting sensitive data and systems from potential threats, such as cyberattacks or data breaches.

Firewalls can be hardware-based, software-based, or a combination of both, and they can enforce security policies that dictate what kind of traffic is allowed or blocked. This makes them essential components of network security, as they help establish a controlled environment that reduces the risk of malicious activities.

Other options, such as storing data securely, increasing internet speed, or managing server connections, do not pertain to the fundamental function of a firewall in network security. These activities may involve different tools and technologies but are not the primary focus of a firewall's design and purpose.