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

The primary function of a firewall in a network is to control incoming and outgoing network traffic based on predefined security rules. Firewalls act as a barrier between a trusted internal network and untrusted external networks, such as the internet. They analyze data packets trying to enter or exit the network and determine whether they should be allowed through based on various criteria, including IP addresses, port numbers, and specific protocols.

This function is crucial for protecting the network from unauthorized access, attacks, and a variety of threats. By allowing only legitimate traffic that meets the established security rules while blocking potential harmful traffic, firewalls help maintain the confidentiality, integrity, and availability of the data within the network.

Other options may suggest various aspects of network management but do not accurately represent the core purpose of a firewall. For instance, while monitoring network activity might be a feature associated with some firewalls, it is not their primary function. Enhanced internet speed could be a side effect of certain configurations, but it does not reflect the essential role of a firewall. Similarly, storing user data securely is related to data security practices but not directly relevant to what a firewall does.