To test the firewalling capabilities of these cards, we used NMAP, which is a port scanning tool that checks IP addresses for open ports and therefore potential access points for hackers to exploit and gain access to the system. All cards that supported the firewalling options provided excellent control for allowing and denying access to ports. Some even allowed the administrator to set the firewall configuration to open and close access to ports during set time periods, for instance, to open a specific port between the hours of 8am and 6pm Monday to Friday to allow telecommuters access to their data during operating hours only. 
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