searching engine in Client Deployment Wizard

Found there are two ways to find out unmanaged computers. One is unmanaged detector, the other is client deployment wizard. In client deployment wizard, click Search Network -> Find computers -> IP address range. The result include managed/unmanaged SEP clients and some other network devices,like router. How the searching engine work? according to ping and nslookup result?
There is an article says the searching result by Client deployment wiard, also can be found in DB sem5 dbo.network_scan_result. Does it mean the searching engine is working automatically and record the search result into DB on schedule?