What is the purpose of a firewall in a network?

The purpose of a firewall in a network is to control incoming and outgoing network traffic. Firewalls act as a security barrier between a trusted internal network and untrusted external networks, such as the internet. By monitoring and regulating traffic based on predetermined security rules, firewalls determine which data packets are allowed to enter or leave the network.

Controlling traffic is crucial for maintaining the security of sensitive information and preventing unauthorized access. Firewalls can block harmful data packets, restrict access to certain applications, and help in the detection of suspicious activity. This functionality is a fundamental aspect of network security strategies.

In contrast to this key role, some other functions mentioned, such as enhancing wireless connectivity, speeding up network performance, and removing viruses, relate to different aspects of network management and security but do not accurately define the primary purpose of a firewall.