ENVS 1000 Lecture Notes - Lecture 2: Web Browser, Hypertext Transfer Protocol

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ENVS 1000 Lecture 2 Notes Communication Channel
Introduction
Messages to be shared by users and a communication channel to transport the
messages between users.
There is a iplied protocol i this case also
Namely, the assumption that both users share a common language which they both can
speak.
For this example, there are also more subtle protocols that determine how the
connection is made and standards that establish the identities of the users in the form
of addresses o the telephoe etwork—or to be more specific, telephone numbers.
Although these two examples seem superficial and simplistic, they do establish three
essential ingredients for data communication.
First, the data being passed between sender and receiver represents messages that are
to be shared among the parties to the communications.
Second, there must be a communication channel that can capably and reliably transport
the messages.
Third, there must exist protocols that establish accurate and appropriate meaning to the
messages that are understood by both senders and receivers.
The second example also raises the issues of connectivity methods and addressing.
As a more realistic example of real-world data communication, consider the
communication between a Web browser and a Web server.
In this case, the message sent by the browser is a request for a Web page to be sent by
the server.
Assuming that everything works correctly, the response message by the server is a Web
page to be displayed on the browser.
The standard protocol used for this communication is HTTP, hypertext transfer protocol.
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