Introduction to Firewall Technology and Its Facilities with Respect to Modern Networking Vendor
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
Difference between Firewall and Router | Firewall vs Router
Hardware Firewalls vs Software Firewalls
What is the difference between single hardware firewall and router? - Information Security Stack Exchange
Software Firewall vs Hardware Firewall: Which is Better? - Businesstechweekly.com
Network Firewall vs Network Switch vs Network Router | FS Community