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The layers in the OSI and TCP/IP models represent different actions in the process of transfering the data.
The benefit of transforming data into packets is that each packet is chunked to about one kilobyte in size making them easy to send over the internet.
UDP is referred to as a connectionless protocol because with UDP you do not establish a strong secure connection between the sending and recieving serverss
There can be multiple socket connections on a single socket server application.
A socket connection application can only connect to one socket server at a time.
You can create an application that is serves as both a socket server and a socket connection as long as they do not use the same port at the same time.