The Cisco IDS 4200 Series appliance sensors are purpose-built, high-performance network security "appliances" that protect against unauthorized, malicious activity traversing the network, such as attacks by hackers. Cisco IDS sensors analyze traffic in real time, enabling users to quickly respond to security breaches. When unauthorized activity is detected, the sensor can send alarms to the management console(s) with details of the activity. Additionally, the Cisco IDS Active Response System delivers unparalleled protection by controlling other systems, such as routers, firewalls, and switches, to terminate unauthorized sessions. The installation and management of these turnkey appliances is easy using a wide array of management solutions, including a Web user interface, a command-line interface (CLI), or Cisco's highly scalable CiscoWorks VPN/Security Management solutions (VMS). The Cisco IDS 4250 supports unparalleled performance at 500 Mbps and can be used to protect gigabit subnets and traffic traversing switches that are being used to aggregate traffic from numerous subnets.