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I use one of these.
It's plugged into this then all the pcs and a wireless router setup in bridge mode plugged into it.
PoE - power over ethernet, it won't need another plug, it might need some funky adapters
managed - ususally has a firewall built into it and you can login and mess with stuff on it
unmanaged - just passes traffic past it
smart - some half way between fully managed and unmanged defenition will depend on the brand/model but it sounds cool to write on the box
I've run out of available network connections on my router. Do I just need one of these http://www.ebuyer.com/290289-trendnet-teg-s50g-5-port-gigabit-greennet-switch-with-metal-case-teg-s50g to effectively work as a four-way adapter or is it a more complicated process to ensure that everything is still part of the same network (stuff on the network needs to be able to access network drives, etc not just access the internet).
Cheers
And is there a difference between managed, unmanaged, smart, PoE?