What is the use of a firewall?

• A. To increase network speed
• B. To protect a network by controlling traffic
• C. To manage user access to applications
• D. To store backup copies of data

Answer: (B)

A firewall serves the essential function of protecting a network by controlling the traffic that is allowed to enter or leave it. This is achieved through a set of predefined security rules that filter the data packets passing through, based on criteria such as IP addresses, ports, and protocols. By monitoring and controlling incoming and outgoing network traffic, a firewall helps prevent unauthorized access to the network and defends against potential threats, such as hackers and malware.

While increasing network speed, managing user access to applications, and storing backup copies of data are important aspects of network administration and data security, they do not accurately define the primary role of a firewall. Firewalls specifically focus on safeguarding the network from security breaches and maintaining the integrity of the information being transmitted.