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UDP does not insert sequence numbers. The packets are expected to arrive as a continuous stream or they are dropped.  What is the meaning of this line?(does it mean UDP discard out of order packets?)

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Need for UDP.

1. Where Applications needs 1 request / 1 reply

   For ex - DNS, DHCP.

We don't need sequence number in UDP because We are not sending streams of Bytes(Like TCP), we just sent small packets.

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