What is the function of a firewall in a network?

The function of a firewall in a network is primarily to prevent unauthorized access. Firewalls are critical security devices that monitor and control incoming and outgoing network traffic based on predetermined security rules. By establishing a barrier between a trusted internal network and untrusted external networks (such as the internet), firewalls help protect sensitive data and resources from external threats and unauthorized users.

They can filter traffic based on various parameters, such as IP addresses, ports, and protocols, ensuring that only legitimate requests are allowed while blocking potential attacks or breaches. This capability plays a crucial role in maintaining a secure environment, especially when it comes to protecting sensitive organizational data from malicious actors.

The other options provided, like improving network speed, managing bandwidth, and storing data, do not accurately describe the primary purpose of a firewall. While a firewall might indirectly affect network performance by filtering traffic, its main role is focused on securing the network rather than optimizing speed or managing data storage.