"Why should it be simple when it can be complex?" -- Folklore You are reading your email off your portable computer and you have a constantly updated weather map on your desktop. You may be chatting through an instant messaging service and may be listening to live-streamed audio, and may start talking on the computer videophone. You move to a different room, so you unplug your network cable, and you know a wireless link will keep those communications running. Your local router has to realize the situation and stop transmitting communications packets to the cable interface and start transmitting them to the computer's wireless interface, and any broken sessions have to be re-established with remote servers. You are the same person using the same network services on your same computer through your same router, but you experience service slowdown or even need to reinitiate some of the communications. Why?
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