The SonicWALL Network Security Appliance (NSA) 220 and NSA 220 Wireless-N Series high-performance Next-Generation Firewalls offer branch offices and distributed enterprises in-depth frontline security, application and user control, network productivity and optional 802.11 dual-band wireless. The NSA 220 Series firewalls act as the first line of network defense against viruses, Trojans, key-loggers and other application layer attacks, without compromising network performance. Management is simplified by consolidating many functions, including network security, remote access and wireless.