A Cisco firewall is a network security device used to monitor, filter, and control network traffic to prevent unauthorized access and malicious attacks. The firewall protects the network from threats by examining information about the source, destination, content, and context of packets and enforcing security policies.
Cisco firewalls support deep packet inspection, provide VPN and IPS functionality, and support multi-layered security policies. In addition to firewalls, Cisco offers comprehensive security solutions, including security management, endpoint security, and threat detection and defense. Together, these solutions build a comprehensive network security system that can detect and respond to evolving network threats in a timely manner.