Re: Protocol Definition
Joe Touch <touch@isi.edu> Thu, 19 January 2012 02:24 UTC
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Date: Wed, 18 Jan 2012 18:23:40 -0800
From: Joe Touch <touch@isi.edu>
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To: Kaushal Shriyan <kaushalshriyan@gmail.com>
Subject: Re: Protocol Definition
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On 1/3/2012 5:53 PM, Kaushal Shriyan wrote: > Hi, > > Can someone please explain me the term "Protocol". Does it also mean it > has some software code underlying beneath it. Please help me understand. My 2 cents: A protocol is a defined set of rules that function at multiple locations (communication endpoints) that enable shared state (communication), and is composed of: a defined set of messages ("on the wire" part) a defined set of states (localized endpoint state) a set of rules that relate message arrival, message departure, time (optionally), and state transition It's a lot like computation where the input is the received message sequence and the output is the transmitted message sequence. A protocol is to communications as an algorithm is to computation. Code can be used to implement an algorithm. Code can be used to implement a protocol on an endpoint. I.e., a protocol is just a special kind of algorithm - one that is used to support communication. A running algorithm is called a process or thread (typically). Since a protocol *is* an algorithm, a running protocol is just called a communicating process or thread, IMO. A "session" or "connection" defines an association between multiple parties running the same protocol and thus communicating. Joe
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