You will find a firewall in the computer server room between the modem and the server typically. Every network is different and will require different types of Firewalls. Some may have switches built into them, others routers, but in each situation the hardware that is chosen has to fit the network. Netmobile utilizes multiple hardware configurations from the largest names in the business. We use hardware from Netgear, CISCO, and PFSense to name but a few.