What is the primary function of a firewall?

What is the primary function of a firewall?

• A. To accelerate data transfer.
• B. To monitor and filter network traffic to/from a device or network.
• C. To manage printer queues.
• D. To back up data.

Answer: (B)

Firewalls act as a security barrier between trusted networks and untrusted ones, like the internet, and their main job is to monitor and filter the traffic that passes to and from a device or network. They examine data packets based on rules you set—such as which IP addresses, ports, or protocols are allowed—and block anything that looks suspicious or unauthorized. This helps prevent attackers from reaching your systems and stops malware from spreading, while still letting legitimate communication occur. It’s not about speeding up data transfer (firewalls can introduce a small delay due to inspection), and it isn’t about printing or backing up data. Those tasks are handled by separate tools and systems.

Firewalls act as a security barrier between trusted networks and untrusted ones, like the internet, and their main job is to monitor and filter the traffic that passes to and from a device or network. They examine data packets based on rules you set—such as which IP addresses, ports, or protocols are allowed—and block anything that looks suspicious or unauthorized. This helps prevent attackers from reaching your systems and stops malware from spreading, while still letting legitimate communication occur. It’s not about speeding up data transfer (firewalls can introduce a small delay due to inspection), and it isn’t about printing or backing up data. Those tasks are handled by separate tools and systems.