UDP and TCP are modest communication protocols in TCP/IP protocol stack. UDP and TCP are located on the Transport layer. It is the lowest level of starting writing distributed systems. It is not about computer network but it is about distributed systems. Every distributed systems programmer needs to understand the distinguish between them very clearly. This article will show you the difference to clear all your doubt.
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Somebody might know Moore’s Law and what it had been referred to. In April 1965, co-founder of Intel Gordon Moore expressed the prediction of an advancement in developing transistors leaded to gain capacity and processing power to electronic devices particularly computer. The part of his article can be downloaded here: Moore’s Law
The density of transistors on a chip doubles every 18 months, for the same cost.
His theory is pretty right for several decades. This can be proved in the graph above that shows the trend of a number of transistors in CPU scales linearly for a regular period. So we can imply that today computer has very enormous processing power compares to a very large mainframe developed in 1970s.
One common theme of question may ask is that “if a computer is so powerfully like this, why do we need a Distributed Systems?“