A network firewall is a vital security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Acting as a barrier between trusted internal networks and untrusted external sources, firewalls prevent unauthorized access and cyber threats. They can be hardware-based, software-based, or both, protecting networks from malware, hackers, and data breaches. Advanced network firewalls offer features like intrusion detection, VPN support, and traffic filtering to enhance security.
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