What are the best Networking jobs for learning & progressing in your career?

What type of jobs / companies give you the biggest opportunity to learn industry relevant content to progress in your career?

What are the best type of "stepping stone" jobs / companies?

For example, companies that provide a wide variety of industry relevant experience and not internal only tools that don't translate directly to the real world.

Obviously all jobs provide opportunities for learning. Specially if you are diligent and seeking them out. But there are certainly some types of roles/companies that lend themselves better to getting enough exposure without being overly specialized.