What is the primary responsibility of a firewall in a network?

The primary responsibility of a firewall in a network is to block, deflect, and mitigate attacks. Firewalls serve as a barrier between trusted and untrusted networks, monitoring and controlling incoming and outgoing network traffic based on predetermined security rules. By analyzing packets of data, firewalls can identify and prevent unauthorized access attempts, malicious activities, and potential intrusions, effectively protecting sensitive information and maintaining the integrity of the network.

While optimizing network speed, providing VPN access, and encrypting data are important aspects of broader network security and performance, they are not the primary function of a firewall. Firewalls focus specifically on enforcing security policies and ensuring that only legitimate traffic passes through while blocking harmful traffic, thereby mitigating potential threats to the network. This protective function is crucial for maintaining the overall security posture of any network system.