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Does UDP require a connection before data is sent?
UDP is a connectionless protocol. No connection needs to be established between the source and destination before you transmit data. UDP does not have a mechanism to make sure that the payload is not corrupted. It includes only source and destination port numbers, length of the frame, and a UDP message checksum.
Why is UDP out of order?
UDP Traffic: Out-of-order packets can also be caused by UDP traffic. This issue occurs primarily due to stateless connections and the lack of flow control mechanisms that exist within UDP protocol. These packets get dropped causing retransmission, slowdowns and out-of-order packets.
Can a system receive UDP in a different order?
Yes, it might be that the application on system B receives the UDP packets in a different order than they were sent by the application on system A. If both systems are connected to the same network segment, the likelihood of it occurring is small, but will never be negligible.
How often does UDP deliver packets without duplicating them?
While UDP does deliver packets reliably 98-99% of the time, without duplicating packets 99.9% of the time, and in-order 99.9% of the time, there is absolutely no guarantee for either of these (in fact you are expected to be prepared for all of these), and reality verifiably doesn’t look 100% perfect all the time.
What are the features of the UDP protocol?
UDP provides no such features and relies upon the application layer to provide such services. UDP allows you to send a packet, with or without a checksum, and redirects the packet (multiplexes it) to a listening application based on the port number the packet was sent to.
Can a single packet be sent to multiple machines at once?
A single packet can be sent to multiple machines at once by using multicast and broadcast transmission. With UDP, no connection is maintained—each packet sent is treated independently. UDP makes no attempt to control transmission speeds based on congestion. If a packet is lost, the application must detect and remedy the situation.