a hub normally refers to network device that provides local area network
connectivitity between computers. ie. a token ring or ethernet hub. hubs can
connect computers to one another, but only on specific lan segments. routers
provide connectivity between individual lan/wan segments. can't give
explanation on switch as it could have a couple different functions, but i hear
it mostly used in the context of phone/pbx kind of environment. i'm sure others
will respond with much more intelligent explanations than these for you. hope
it helps.
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