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Chapter 6. Monitoring and Maintenance > Maintaining the Sensor
Maintaining the Sensor
You need to be able to perform several maintenance tasks using the sensor.
Licensing
Remember that licensing is extremely important when it comes to the sensor modules and devices. A valid license is required to perform signature updates. If a valid services contract is valid on the sensor, the license can usually be retrieved automatically using either Cisco IPS Device Manager (IDM) or Cisco IPS Manager Express (IME).
