Why are protocols needed? What are the two interfaces provided by it?

Why are protocols needed? What are the two interfaces provided by it?
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1 Answer

Answer :

A protocol is a set of rules that govern data communication. Provides communication service used to  exchange messages.  
Service interface- defines operations that local objects can perform on the protocol.  
Peer interface- defines form and meaning of messages exchanged between protocol peers to implement  the communication service.
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