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This document discusses how traffic moves over the internet in 3 sentences: Internet service providers (ISPs) connect customers to the internet using appropriate data transmission technologies and connect to points of presence (POPs) which are interface points between communications entities. EarthLink and AOL are examples of ISPs that provide internet access via methods like dial-up, DSL, satellite, and cable. Personal digital assistants (PDAs) are handheld computers that can function as mobile phones, smartphones, web browsers, and portable media players.





