> For the complete documentation index, see [llms.txt](https://wiki.zacheller.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.zacheller.dev/network-security/courses/isci-cnss-course/fundamentals-of-firewalls.md).

# Fundamentals of Firewalls

- [What is a Firewall](https://wiki.zacheller.dev/network-security/courses/isci-cnss-course/fundamentals-of-firewalls/what-is-a-firewall.md)
- [Firewall Types](https://wiki.zacheller.dev/network-security/courses/isci-cnss-course/fundamentals-of-firewalls/firewall-types.md)
- [Firewall Implementation](https://wiki.zacheller.dev/network-security/courses/isci-cnss-course/fundamentals-of-firewalls/firewall-implementation.md)
- [Proxy Servers](https://wiki.zacheller.dev/network-security/courses/isci-cnss-course/fundamentals-of-firewalls/proxy-servers.md)
- [Windows Firewalls](https://wiki.zacheller.dev/network-security/courses/isci-cnss-course/fundamentals-of-firewalls/windows-firewalls.md)
- [Linux Firewalls](https://wiki.zacheller.dev/network-security/courses/isci-cnss-course/fundamentals-of-firewalls/linux-firewalls.md)