Enumerates keyword plan forecastable network types.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/enums/keyword_plan_network.proto)

| Enums ||
|---|---|
| ## `GOOGLE_SEARCH` | Google Search. |
| ## `GOOGLE_SEARCH_AND_PARTNERS` | Google Search + Search partners. |
| ## `UNKNOWN` | The value is unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |