Protocols are the agreed rules that let different devices communicate. This topic explains why they are needed and how they are arranged into the layers of the TCP/IP protocol stack — application, transport, internet and link. You will study the purpose of specific protocols including HTTP, FTP, SMTP, POP3 and IMAP, and where each one sits in the stack. Peer-to-peer file sharing, including the BitTorrent protocol, is covered as a contrasting model.
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