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How TCP and UDP packets come to the world
(lemmy.one)
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this post was submitted on 21 Jul 2023
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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.