Lecture 3 (Computer network :Application Layer)

 This lecture includes Applications
and app-layer protocols,Network applications,concept of Client-server paradigm
What Transport Service does an App need,Transport service requirements
of common apps,Services provided by Internet transport protocols TCP,
protocols TCP service,UDP service,Internet apps: their protocols and
transport protocols,The Web: the httpprotocol,Non-persistent and persistent
connections,http message format(request,response,http response status codes),
User-server interaction: authentication,cookies,conditional,Web Caches
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