We begin our discussion of applications by focusing on two of the most
popular—the World Wide Web and email. Broadly speaking, both of
these applications use the request/reply paradigm—users send requests
to servers, which then respond accordingly. We refer to these as “traditional”
applications because they typify the sort of applications that
have existed since the early days of computer networks (although the
Web is a lot newer than email but has its roots in file transfers that predated
it). By contrast, later sections will look at a class of applications
that have become feasible only relatively recently: streaming applications
(e.g., multimedia applications like video and audio) and various overlaybased
applications. (Note that there is a bit of a blurring between these
classes, as you can of course get access to streaming multimedia data over
theWeb, but for nowwe’ll focus on the general usage of theWeb to request
pages, images, etc.)
We begin our discussion of applications by focusing on two of the mostpopular—the World Wide Web and email. Broadly speaking, both ofthese applications use the request/reply paradigm—users send requeststo servers, which then respond accordingly. We refer to these as “traditional”applications because they typify the sort of applications thathave existed since the early days of computer networks (although theWeb is a lot newer than email but has its roots in file transfers that predatedit). By contrast, later sections will look at a class of applicationsthat have become feasible only relatively recently: streaming applications(e.g., multimedia applications like video and audio) and various overlaybasedapplications. (Note that there is a bit of a blurring between theseclasses, as you can of course get access to streaming multimedia data overtheWeb, but for nowwe’ll focus on the general usage of theWeb to requestpages, images, etc.)
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