The Internet protocol suite (article) | Khan Academy
https://www.khanacademy.org/computing/computers-and-internet/xcae6f4a7ff015e7d:the-internet/xcae6f4a7ff015e7d:the-internet-protocol-suite/a/the-internet-protocols
WEBA protocol stack. When a message is sent through the Internet, it doesn't use every protocol in the suite. It does use at least one protocol from every layer, however. When you're loading a webpage from a domain your browser has never visited before, your browser may need to make a DNS request.
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