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How TCP and UDP packets come to the world (lemmy.one)

submitted 1 year ago* (last edited 1 year ago) by speaker_hat@lemmy.one to c/programmerhumor@lemmy.ml

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[–] andrew@lemmy.stuart.fun 7 points 1 year ago

UDP is a transport protocol. OSI layer 4. It sits atop the packet (network/L3) layer which is where IP dictates where a packet is going. A broadcast or multicast IP address would mean it can be observed by many machines, but unicast is still the most common, and is routed to just one machine.