SonicWALL NSA 250M Series high-performance, modular 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 250M acts as the first line of network defense against viruses, Trojans, key-loggers and other application layer attacks, without compromising network performance. The NSA 250M can be extended with a variety of modules, such as T1/E1, DSL and SFP Modules, in order to provide deployment flexibility and additional failover capabilities. By consolidating equipment, the modular solution reduces acquisition and maintenance costs.