The Dell Sonic WALL Network Security Appliance (NSA) 220 Wireless-N series high-performance next-generation firewall offers branch offices & distributed enterprises in-depth frontline security, application & user control, network productivity & optional 802.11 dual-band wireless. The NSA 220 series firewalls act as the first line of network defense against viruses, Trojans, key-loggers & other application layer attacks, without compromising network performance. Management is simplified by consolidating many functions, including network security, remote access & wireless.