Powerline Networking and Switches
Have been using Dlink 301 for over a year. REALLY easy to set up and configure. Just need to run the admin program once to give the units a name. They connect to each other without effort. Not sure anyone should care about the encryption, perhaps in an apartment building, not required in a house. Units overheat. Had to exchange 3 pairs, at least one of each pair dying within 2 months. This happened even though unplugged as much as possible. So keep your bill handy for returns. Took the covers completely off to keep them cool, that has increased the lifespan.
They also don't work well through a UPS, so can't protect them from power surges.