Не само си тъп, ами си тъп и упорит!!!
Точно това значи!!!
Като не е еднопосочен поток, как разбираш, че пакета ти е стигнал отсрещната страна??? Или при гуру като теб всичко е 100% сигурно (и двупосочно)???

При търсене в гугъл за UDP и connectionless:

В отговор на:

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Results 1 - 10 of about 49,700 for connectionless +UDP

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UDP, defined in [RFC 768], does just about as little as a transport protocol can. Aside from the multiplexing/demultiplexing function and some light error checking, it adds nothing to IP. In fact, if the application developer chooses UDP instead of TCP, then the application is talking almost directly with IP. UDP takes messages from application process, attaches source and destination port number fields for the multiplexing/demultiplexing service, adds two other fields of minor importance, and passes the resulting "segment" to the network layer. The network layer encapsulates the segment into an IP datagram and then makes a best-effort attempt to deliver the segment to the receiving host. If the segment arrives at the receiving host, UDP uses the port numbers and the IP source and destination addresses to deliver the data in the segment to the correct application process. Note that with UDP there is no handshaking between sending and receiving transport-layer entities before sending a segment. For this reason, UDP is said to be connectionless.

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