> For the complete documentation index, see [llms.txt](https://docs.thousandeyes.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.thousandeyes.com/product-documentation/device-layer.md).

# Device Layer

ThousandEyes' device-layer monitoring uses [Enterprise Agents](https://docs.thousandeyes.com/product-documentation/global-vantage-points/enterprise-agents) to poll your network devices using the Simple Network Management Protocol (SNMP).

![](/files/-M5xtUfCHen9WmLzTPEH)

The Enterprise Agents must complete an initial device discovery process prior to monitoring the desired devices. So the basic steps are as follows:

1. [Configure credentials](https://docs.thousandeyes.com/product-documentation/device-layer/discovering-device-layer-devices#configuring-device-credentials) for one or more devices, so that they can be discovered.
2. Launch a [one-time](https://docs.thousandeyes.com/product-documentation/device-layer/discovering-device-layer-devices#one-time-discovery) or [scheduled](https://docs.thousandeyes.com/product-documentation/device-layer/discovering-device-layer-devices#scheduled-discovery) device discovery action.
3. [View the results of the device discovery](https://docs.thousandeyes.com/product-documentation/device-layer/device-discovery-results).
4. Once you have set up devices for monitoring, [view the data](https://docs.thousandeyes.com/product-documentation/device-layer/using-the-device-layer-view) from those devices.