Software that prevents external access to a system typically falls under the category of firewall software. Firewalls can be either hardware or software-based, and they work by monitoring and controlling incoming and outgoing network traffic based on predetermined security rules. Popular firewall software includes:
1. Windows Firewall:
Built into the Microsoft Windows operating system, it provides basic firewall capabilities.
2. iptables:
A Linux-based firewall utility that allows system administrators to configure rules and policies governing network traffic.
3. pfSense:
An open-source firewall and router software based on FreeBSD. It offers advanced features and is often used in enterprise environments.
4. Cisco ASA (Adaptive Security Appliance):
A hardware firewall developed by Cisco Systems commonly used in large enterprise networks.
5. Check Point Firewall:
A software-based firewall solution developed by Check Point Software Technologies, widely used in enterprise environments for its advanced features and security capabilities.
6. Sophos XG Firewall:
A next-generation firewall solution that provides advanced threat protection, web filtering, and network security features.
These are just a few examples, and there are many other firewall software options available, each with its own features and capabilities. The choice of firewall software depends on factors such as the specific requirements of the organization, budget, and level of expertise of the administrators.
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