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Computing Academy GCSE Computer Science

have been agreed. Once

have been agreed. Once this has happened, the client can go ahead and request a file or service. TCP Transmission Control Protocol (TCP) is the protocol used to break up large amounts of data into packets (small chunks of data) before they are sent over a network. The protocol ensures that the packets are put back together correctly at the destination to recreate the original data. IP Internet Protocol ensures that when sending data across a network it arrives at the correct intended IP address. SMTP / POP / IMAP The Simple Mail Transfer Protocol (SMTP) is the most common protocol used for sending email. Post Office Protocol (POP) and Internet Message Access Protocol (IMAP) are common protocols for retrieving email. When checking your email using POP, the emails are usually downloaded to your computer and deleted from the mail server. When checking your email using IMAP, the emails are generally left on the mail server. If you only use one computer system POP is a good choice, but if you wish to access email from multiple devices you’ll need to use IMAP, as POP will delete them from the mail server. 115

HTTP Hypertext Transfer Protocol (HTTP) is the standard protocol used for transmitting webpages (built using Hypertext Markup Language - HTML) over the Internet. Although modern web browsers do this for us if we forget, when visiting any website, the domain name is also preceded by the http:// prefix to let the browser know that this protocol needs to be used. FTP Viewing websites is handled using HTTP, but in order to copy those website files to the web server (so that they become live on the Internet), we need to use the File Transfer Protocol (FTP). 116

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