Firewalls are the security source of protect of external threat. Followings are the top 7 firewalls.
Check Point Software technologies FireWall-1.
AXENT Technologies Raptor Firewall.
CyberGuard Corp. CyberGuard Firewall Release 4.0.
Secure Computing Corp. SecureZone.
Cisco Systems Cisco PIX Firewall 520.
NetScreen Technologies NetScreen-100.
NetGuard Guardian 3.0 Firewall for Windows NT.

Awesome! its really useful to have a firewall to protic are PC from all the virus. .

Nice post. But may I remind that Cisco runs only on Cisco hardware. There are many free firewalls also such as IPCop and IPFire that run on Linux-based appliances.

Never heard of them, but I’ll surely try them.