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How the Internet Works: The 7 Steps It Took To Read This Article
Celebrate ARPANET's 50th anniversary by learning how packets run the internet.
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GARY WATERS
Fifty years ago, the Advanced Research Projects Agency Network, which we lovingly refer to as ARPANET, went live, a packet-
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switching network and the ?rst to implement the TCP/IP protocols that
have become the technical backbone of the internet.
.
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But what does that all mean and just what are the steps involved in even some of the basic functions of enjoying the internet,
such as, say, reading your favorite PopularMechanics.com article?
Dr. Cecilia Aragon, director of the Human-Centered Data Science Lab at the University of Washington in Seattle, one of the
top-ranked computer science programs in the country, explains the steps.
"THE BROWSER SETS UP A CONNECTION BETWEEN YOU AND SOMEBODY ELSE, SOME OTHER SERVER SOMEWHERE ELSE
IN THE WORLD."
“A great analogy,” she says, “is it is like a telephone network for data instead of voice. Every piece of information you get,
when you download an article from the server, there is another human on the other end producing that information. It is
broken into packets and sent over wires and made visible onto the computer of the person who is reading it.”
Aragon says the step-by-step process of doing something as basic as reading an article on the Internet is really not at all that
simple.
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Everything starts with a computer, a device already designed to take bits of zeroes and ones and converting them into pixels
on a screen so humans can understand the information. From there, once that computer launches an operating system,
whether Windows, MacOS, Linux or something else, a browser runs on top of that operating system.
The browser—again, there are multiple options, from Safari to Google Chrome—serves as a special program designed to
collect packets and make connections to other computers to get information.
“The browser sets up a connection between you and somebody else, some other server somewhere else in the world,” Aragon
says.
How the Internet Works
This is the room where ARPANET first connected on October 29, 1969.
ROBYN BECK / GETTY IMAGES
Let’s call this STEP ONE. To start, your browser sends a request to read the article you’re engrossed in right now via your
Internet Service Provider (ISP) that can connect to the internet. That message included your browser sending a request, with
your computer’s Internet Protocol (IP) address, to the server holding all the information from the Popular Mechanics’ website,
basically saying “I’m interested, send me that collection of packets.”
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You may have known the Domain Name Server (DNS) of the internet site you wanted to get information from, but computers
thinks much more black and white. That’s where STEP TWO comes into play, as your browser turns the DNS into an IP
address of, in this case, the Popular Mechanics website’s server. Then, STEP THREE, where your browser requests a
Transmission Control Protocol (TCP) connection with the Popular Mechanics server, basically a permission to send messages
happens. A quick STEP FOUR allows the server to respond to the request by saying "sure, we can send that along" — known
as a 200 OK message — or a "sorry, we don’t have those bits any longer," commonly rendered as a 404 Document Not Found.
With the conversation started and the request accepted, the really interesting STEP FIVE comes into play, establishing a
Hypertext Transfer Protocol (HTTP) that will create levels of packets of information (an FTP server, in contrast, uses the ?le
transfer protocol, another popular protocol that dictates the framework that servers use to operate as part of the internet).
Every packet contains a header of bits of info that tell servers and browsers where the packet needs to go and its purpose.
“It gets very complicated, very quickly,” Aragon says. “You can think of a packet as a piece of information stored as a series of
high and low voltage, essentially binary because all information can be represented in binary form.”
"IT IS LIKE A TELEPHONE NETWORK FOR DATA INSTEAD OF VOICE. EVERY PIECE OF INFORMATION YOU GET, WHEN YOU
DOWNLOAD AN ARTICLE FROM THE SERVER, THERE IS ANOTHER HUMAN ON THE OTHER END PRODUCING THAT
INFORMATION."
Then comes the really fun part, STEP SIX, as the packets of information must travel by that TCP protocol. These TCP packets
—collections of bits placed essentially into the digital version of a complex envelope—get transmitted across wires, cables or
WiFi in the form of low-volt and high-volt data. The packets, using the IP address so they know where to go, move from
router to router, across cables, ?ber optic cables, phone lines and WiFi until they run through however many routers are
needed to arrive at your physical location, always moving at the speed of light and generally traversing the world.
Sometimes the packets hit slowdowns of heavily congested areas along the way and must change course and sometimes they
can ?nd a direct route back to you.
Every router knows only what it needs to know. The ?rst router may not know the ?nal destination of the packets of
information, but it knows part of the way. The subsequent router knows the next place it needs to go and so on until the
packets get back to you.
Once the requested packets arrive, STEP SEVEN kicks into place, allowing the browser to convert all those words and images
from the packets back into a humanly readable article.
“Some may get lost and be resent again, but that goes through a number of routers back and forth until it gets back to your
ISP and then your ISP sends the packets back to the router through WIFi to a port on your computer and then your browser,
which is listening for those packets, takes the data and displays them in a form you as a human can understand,” Aragon says.
“And that is incredibly oversimpli?ed.”
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The Internet's Uncertain Future
ANADOLU AGENCY / GETTY IMAGES
The future of the internet isn't necessarily all good news.
All those internet cables and radio frequencies? They can be throttled so that information can move at various speeds, hence
that whole net neutrality discussion. Servers can also control how quickly they respond to requests for packets and sometimes
websites go down because there is a physical limitation of how many high and low voltage signals a server can sent out at one
time. Maybe a server can handle millions of requests for connections at one time, but not billions.
With physical wires and radio frequencies and their bandwidth limitations, Aragon says we are already now starting to run
into some physical limitations. Even IP addresses, which can account for something in the range of four billion addresses,
have met an issue because of the eight billion network-connected devices.
Even at 50 years old, the internet sure looks young compared to what’s coming.
TIM NEWCOMB
Tim Newcomb is a journalist based in the Pacific Northwest.
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M O R E F RO M
WELCOME TO INTERNET WEEK
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