Yes, it comes with an small AC adaptor
At the very minimum each device must have a NIC adaptor to connect to the network. There also must be some type of media (either cable or wireless), and usually a connectivity device, such as hubs, switches, routers, etc.
standalone hubs
Some network hubs have them installed for protection
Network hubs are platform independent. That is, they don't distinguish between Macs or PC's.
cabling
it is a switch in hubs
Nearly all network hubs allow any compatible device, including printers, to be shared.
You simply plug the second hub into the first. Modern hubs will be just peachy in the configuration.
No software is needed for network hubs.
There is no magazine that is specific to network hubs and switches. However, PC Magazine is a computer magazine available on newsstands and MozillaQuest (http://mozillaquest.com/index.html) is an online magazine that may include articles and other information on network hubs and switches.
That would depend on the network topology chosen and the type of network connectivity devices employed. In a properly constructed, switched and/or routed network the answer would be NO. If hubs or repeaters are used to connect devices and/or network segments, then yes. In a bus or ring topology, the answer is yes. Whether anything is done with the frame is a different matter and depends on whether you consider the network adaptor to be integral to the computer.
yes