# 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).

![](https://1112912342-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M4QARF6s57qxMrOHDTZ%2Fuploads%2Fgit-blob-edf9cba88c2dbc7f1d7ed32ef095b1bb24a4181c%2Fproduct-documentation_device-layer_discovering-device-layer-devices-1.png?alt=media\&token=2e844dd5-3892-4a3a-8986-87be2efe1865)

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.