How to configure Cisco firewall
Here you can learn about freely available Cisco networking devices emulators and about configuring virtual configuring of firewall for the routers
I want to know the steps and procedures to configure a firewall in Cisco. I want to know the required skills of a network security engineer and where should I learn networking security concepts for free? Can I able to virtually configure Cisco firewall on applications like GNS3, and Cisco packet tracer etc?