Introduction to networking,app layer protocol like http, ftp, smtp, pop,dns

this lecture includes client server paradigm,service models, applicatipn
layer protocol like http, ftp, smtp, pop,dns etc in great details and concept of Socket.
Non-persistent and persistent connections,http message format,Web Caches,
Content Delivery ,ftp commands, responses,email ,Message format,MIME 
types,Mail access protocols,DNS records,TCP sockets,UDP Sockets 
and related example
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