What is one of the core functions of a firewall in a network?

One of the core functions of a firewall in a network is to filter and monitor incoming and outgoing traffic. Firewalls serve as a security barrier between trusted internal networks and untrusted external networks, like the internet. By analyzing and controlling the data packets that attempt to enter or leave the network, firewalls help prevent unauthorized access and protect against various security threats, such as malware and intrusions.

Firewalls accomplish this through a set of predefined security rules that dictate what types of traffic are allowed and what types should be blocked. This traffic filtering is essential for maintaining the integrity and security of the network, ensuring that only legitimate traffic is permitted while harmful traffic is rejected.

In contrast, enhancing user interface design does not relate to the primary function of a firewall; it pertains more to application development. While a gateway server does handle traffic, it typically serves broader functions than just acting as a firewall. Storing data securely is the role of data storage solutions and not specifically a function of a firewall. Thus, filtering and monitoring traffic remains the essential and defining function of a firewall in network security.