There are two main connection protocols: TCP and UDP, and the latter is a “connectionless” protocol, so how is data transferred if there is no established connection between sender and recipient?
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The TCP protocol is basically “hey? Did you get my packet? Yes? Okay, next one. No? Okay, I’ll send that one again.” It’s a constant back-and-forth that makes sure every packet was sent and received.
UDP is a little different. You’re shooting the packets at the recipient without confirming that each individual packet was received.
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