A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and untrusted external networks, such as the Internet. By examining data packets and rejecting those that do not meet the specified security criteria, a firewall helps protect against unauthorized access, malicious software, and other cyber threats.
Checking firewall settings is crucial for maintaining a secure network infrastructure. It ensures that the firewall is properly configured and functioning effectively to safeguard against potential vulnerabilities. Regularly reviewing and adjusting firewall settings is essential, especially when making changes to the network environment, installing new software, or encountering security alerts.