Intro to Firewalls. A firewall is hardware, software, or a combination of both that is used to prevent unauthorized programs or Internet users from accessing. - ppt download
Do I Need a Firewall if I Have a Router?
What is Hardware Firewall? - sunnyvalley.io
What is a Hardware Firewall? Compare Hardware to Software| Fortinet
What is the difference between single hardware firewall and router? - Information Security Stack Exchange
pfSense® - World's Most Trusted Open Source Firewall
Best Hardware Firewalls for Home and Small Business Networks - sunnyvalley.io
Software Firewall vs Hardware Firewall: Which is Better? - Businesstechweekly.com