What is the role of firewalls in network security?

Firewalls play a critical role in network security by acting as a barrier between trusted internal networks and untrusted external networks, such as the internet. Their primary function is to protect systems from unauthorized access by monitoring and controlling incoming and outgoing network traffic based on predetermined security rules. This means that firewalls can effectively filter out potentially harmful traffic, preventing malicious requests or unauthorized users from gaining access to sensitive information or resources within a secure network.

In addition to blocking unauthorized access, firewalls can also detect and respond to certain types of threats, helping to maintain the overall integrity and confidentiality of the data contained within a network. This proactive measure helps organizations safeguard their assets against various cyber threats, making firewalls an essential component of a comprehensive cybersecurity strategy.

Other options refer to different functions that do not align with the primary role of firewalls; they do not focus on the aspect of unauthorized access. Improving internet speed, backing up data securely, and managing user accounts each pertain to different areas of IT management and security but do not describe the specific purpose of firewalls in network security.