In the context of network security, what does a firewall do?

A firewall plays a crucial role in network security by allowing or blocking network traffic based on established security rules. This function involves monitoring incoming and outgoing traffic and determining whether it should be permitted or denied based on predefined criteria. Firewalls help create a barrier between trusted internal networks and untrusted external networks, such as the internet. This protective measure is essential for preventing unauthorized access, as well as protecting sensitive data from potential threats.

By filtering network traffic, firewalls can prevent harmful applications, viruses, and other types of cyberattacks from infiltrating a company’s network. They can also enforce company policies regarding internet usage by blocking access to certain websites or applications based on the set rules.

The other choices relate to different aspects of networking or security but do not capture the primary function of a firewall effectively. Amplifying network signals pertains to signal processing rather than security. Analyzing and managing network traffic is a broader function that involves various tools and practices beyond just the capabilities of a firewall. Increasing internet speeds is unrelated to the security functions of a firewall, as firewalls manage traffic primarily based on security rather than enhancing speed.