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

The primary function of a firewall in a network system is to prevent unauthorized electronic access. Firewalls act as a barrier between a trusted internal network and untrusted external networks, such as the internet. They analyze incoming and outgoing traffic, applying a set of predefined security rules to block or allow data packets based on their source, destination, and content. This protects sensitive information and resources from potential threats, such as hackers or malicious software, ensuring that only legitimate traffic is permitted.

While increasing internet speed, performing regular backups, and providing antivirus protection are important functions in a network environment, they are not the core function of a firewall. Firewalls focus specifically on access control and monitoring, thereby playing a crucial role in maintaining network security.