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Passive network Monitoring

Service Availability Monitoring
Continuous Vulnerability Monitoring

Passive scanning is a method of vulnerability detection that relies on information gleaned from network data that is captured from a target computer without direct interaction.

For an intruder, passive scanning's main advantage is that it does not leave a trail that could alert users or administrators to their activities.

For an administrator, the main advantage is that it doesn't risk causing undesired behavior on the target computer, such as freezes.

Because of these advantages, passive scanning need not be limited to a narrow time frame to minimize risk or disruption, which means that it is likely to return more information.