What is a firewall primarily used for in network security?

• A. To monitor employee productivity
• B. To filter incoming and outgoing network traffic
• C. To create backup copies of data
• D. To improve internet speed

Answer: (B)

A firewall is primarily used for filtering incoming and outgoing network traffic, which plays a crucial role in maintaining network security. Firewalls establish a barrier between a trusted internal network and untrusted external networks, such as the internet. They analyze data packets based on predetermined security rules and allow or block them accordingly. This capability helps prevent unauthorized access to network resources, protects sensitive data, and blocks potential threats such as viruses, worms, and hacking attempts.

In the context of network security, the other options do not align with the primary function of a firewall. Monitoring employee productivity involves tracking how employees use resources, which is not related to the filtering of network traffic. Creating backup copies of data is about data preservation and recovery, rather than securing the network. Improving internet speed relates to connection optimization, which is outside the scope of a firewall’s functions. Therefore, the correct choice highlights the essential role of firewalls in safeguarding networks by filtering data traffic.