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Ping sweep, ARP, ports, SNMP and names on the collector's own subnet.
Ask a router over SNMP which VLANs and routes it has, then pick which to scan.
Ask monitored switches and routers what is plugged into them: APs, switches, hosts.
Read each site router's VLANs (routers named like 06_HAM_RT01) and scan them over the WAN.
One or more networks, comma-separated (max /20 each).
Run a discovery above. Results appear here; tick the devices to monitor and add them.
Problems someone has said they're handling. An acknowledgement clears itself when the sensor recovers.