UDP vs TCP

In the case of UDP, a server is called an iterative. It means that when a server is dealing with encapsulation requests, it processes only one request at a time. A client prepares a UDP request packet, encapsulates inside an IP packet, and sends it to the server. The server processes the request, forms a UDP responsible packet and sends it back to the client. In the meanwhile, if more UDP requests arrive at the server, server does not pay any attention to them. It completes servicing one UDP request before taking up any other UDP request. In order to ensure that the UDP requests received in the meantime are not lost, server stores them in a queue of waiting UDP requests, and processes them one after the other.

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