Do I need a hardware appliance on every site?
No NetSenX appliance is needed: the agent is software that runs on a host you choose. One agent connected to a SPANSPAN: switch port analyser. A switch setting that sends a copy of network traffic to one port, where a sensor can watch it. or TAPTAP: test access point. A small device that copies the traffic on a network cable for a sensor to watch. port watches the whole segment and counts as one device.
This answer also appears, with more context, here: OT network monitoring
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Terms used here
- SPAN (switch port analyser)
- A switch setting that sends a copy of network traffic to one port, where a sensor can watch it.
- TAP (test access point)
- A small device that copies the traffic on a network cable for a sensor to watch.