Search Stage of Discovery

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Search is the first stage of Discovery Process. Its objective is to find available network hosts and detect the services/applications they're currently running. This is achieved by scanning IP addresses for specified services, i.e. trying to communicate with each of the services assigned for discovery at a particular IP address. How the scan is actually accomplished is determined by discovery search parameters.

Search parameters specify what to search for, where to search, and how to search:

What to scan for? This question is answered at Service Selection step with a list of services to be discovered are specified along with scan options for each.
Where to scan? Host Addresses Specification step allows to build the list of IP addresses to be scanned.
How to scan? Discovery Tuning step tells how to go about the scanning process concurrency, time limits, and accuracy.

The way how parameters are set depends on the discovery mode:

In a full interactive mode a wizard drives a user through the procedure of specifying discovery parameters.
In single-device interactive and automatic modes default discovery settings are used.
Parameters of a headless discovery are specified in job properties.

Thus, we can say the Search stage is divided into two parts: parameters specification and scanning process itself i.e. search itself with respect to the parameters provided.