What is the main objective of a firewall?

The main objective of a firewall is to prevent unauthorized access to networks. Firewalls act as a security barrier between trusted internal networks and untrusted external networks, such as the internet. They monitor and control incoming and outgoing network traffic based on predetermined security rules. By doing so, firewalls help protect the network from various threats, such as cyberattacks, malware, and unauthorized access by imposing restrictions and filters on the data packets that pass through.

While having a fast internet connection is desirable, it is not the primary function of a firewall. Similarly, allowing all communications freely would undermine the very purpose of a firewall, which is to enhance security. While encryption of sensitive data is a critical aspect of data security, it is distinct from the role of a firewall, which focuses on regulating access rather than encrypting information. Thus, the correct answer emphasizes the essential protective role that firewalls play in safeguarding network integrity.