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Why Do We Need Protocols?

Protocol in computers is as a formal description of message formats and the rules two or more machines must follow to exchange those messages. Computers need protocols in order to avoid conflicts of data exchange and also for authentication.
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Why do we still use separate protocols for Email instead of HTTP?
Different protocols are better for each application, so that the protocol so designed can properly express all the data and semantics required by the application. This question is an echo of the mania from about 30 years ago for Remote Procedure Call  www.quora.com
How can we say TCP is a reliable protocol?
The reason that Transmission Control Protocol (TCP) is considered 'reliable' is that the protocol itself checks to see if everything that was transmitted was delivered at the receiving end (it may not have been due to packet loss). TCP allows for the  searchnetworking.techtarget.com
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