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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It’s not that kind of connection – there is still a data path between the sender and receiver. It’s just that from the point of view of the sender, udp is like shouting into the dark – there is no acknowledgement or reply. By “connection”, they mean “no back and forth conversation”.
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