Ongoing maintenance of NBA products is also very similar to
that for network-based IDPSs. The primary exception is the
application of updates. Because most NBA products do not use
signatures, administrators only need to test and apply updates to
the NBA software itself. Because NBA sensors are appliancebased,
updating them usually involves replacing an existing CD
and either rebooting the sensor or installing software from the
CD. For NBA products that do have signature capabilities,
administrators should also acquire, test, and apply signature
updates in the same way that network-based IDPS signature
updates are performed.