Code Studio - U2/L6 - Layers of the Internet Exercise

Helpful Notes + Use the "Layers of the Internet Study Guide" in Code Studio Student Resources to help you answer the questions.

WHAT HAPPENS WHEN YOU VISIT A WEB SITE? When you visit a website you're actually getting sent a file by a server. HTTP is solving the problem of how to ask for that file. Your computer and that server communicate using a protocol called HTTP. HTTP is plain-text, so it literally includes the ASCII word "GET ..." and the file name requested. All of your communications are being sent over the Internet so these requests are being sent inside TCP/IP packets and over the physical wires of the Internet. There are other secure ways of sending information online because using HTTP, all our information would otherwise be sent as plain text. Certificate authorities ensure that when you start a secure connection you're talking to the website you think you're talking to.

WHAT HAPPENS WHEN YOU VISIT CODE.ORG? When you type in code.org, your browser will contact the DNS to find Code.org's IP address. When you receive the address you'll send an HTTP GET request to code.org to send you its homepage. Code.org's server will respond with the HTML code that makes up its web page. All of the communications above happen on the Internet which means TCP or UDP will break the message into packets and then send them. If TCP is used, error checking will occur. IP will route the packets back and forth between your computer and the server All of this information is sent over the physical wires, cable, wifi networks, and routers that make up the physical network of the internet.

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