Many IT admins maintain not only one copper-based network, but also remote sites and wifi networks. To monitor these (more-or-less) remote locations our monitoring software PRTG Network Monitor offers the “remote probe” feature (other vendors call this polling engine, poller, agent, etc.). The user can create as many of them as desired at no additional cost.
The idea is to install a small piece of software on a PC at the remote location. Then it connects to the central monitoring server, receives its configuration, starts monitoring and sends results to the monitoring server.