diff erent between bridge&switch?
a brick! water! foil cools too quick
a thermos retains heat and is practically insulating foam covered with two surfaces made out of whatever polystyrene is a good insulater, if you made a box out of this and sealed it what ever was inside would retain its heat longer than normal
I think soI'm trying to read between the lines hear but I assume you want to build some kind of thermosThe basic idea would be to have two containers, separated by a layer of insulationYou could use an aluminum can for the inner containerIt needs to be completely isolated from the outer container by a layer of insulating materialThat could be styrofoam packing material (best), Fiberglass insulation, or if neither of those is available shredded up news paper The outer container could be a plastic 2 liter bottle cut down or just a larger canI'd go for at least an inch of insulation all the way around the inner aluminum can including the bottomIt would also be better if you could come up with a lid of some kind and insulate it as wellHave fun.
Ok, it's been a few years, but as I recallA true bridge just connects two separate networks of the same type (although this is blurring somewhat recentlyas long as the two network types are able to handle the same types of layer 2 traffic, more and more, people are calling this a bridge) and makes them appear to be one continuous network by sharing any traffic it sees on one side with the other sideSome bridges may utilize a different technology (wireless, t1, VPN over the internet, etc.) between the two networks that it is combining, but the machines on either side are completely unaware of this middle step A hub can be thought of as a multiport bridgeA switch makes layer 2 decisions about what it has learned about the destinations available through each port and will only forward traffic that it thinks might actually be destined for something at the other end of that connectionSometimes refered to as a smart hub because it reduces traffic by not forwarding traffic down links that it knows won't don't need itA router makes layer 3 decisions and connects two DIFFERENT types of networksethernet to dsl, for example Bridges (as opposed to routers) are necessary if you need to transmit non-routable protocols (AppleTalk, Netbios, etc.) or need to transmit broadcast IP (used in a lot of networkable games) trafficOf course switches and hubs will do this too, but as stated above, the middle step of a bridge is transparent with a bridge.
