What is the primary function of a firewall in a network?

• A. To encrypt data traffic
• B. To capture data packets
• C. To filter traffic based on policies
• D. To educate employees about network security

Answer: (C)

The primary function of a firewall in a network is to filter traffic based on predefined policies. Firewalls serve as a security barrier between a trusted internal network and untrusted external networks, such as the internet. They monitor incoming and outgoing traffic and make decisions based on the set rules or policies that determine what type of traffic is permissible and what is not.

By allowing only authorized traffic to pass through while blocking unauthorized or potentially harmful connections, firewalls help protect the network from various threats, including malware and unauthorized access attempts. This capability is essential for maintaining the security and integrity of sensitive data within a network.

The other choices describe functions that are not primarily associated with firewalls. For instance, while encryption is crucial for securing data in transit, it is typically handled by other security protocols rather than firewalls. Capturing data packets is more aligned with network monitoring or intrusion detection systems rather than the filtering role firewalls play. Educating employees about network security is an important aspect of an overall security strategy but does not relate to the technical function of a firewall.