Technology Explained: How The Internet Works

Source: www.makeuseof.com/tag/technology-explained-how-the-internet-works/

Author: Guy McDowell

Once you finish this article, I’m sure you’ll be amazed that the Internet works at all! It’s easy to complain about slow download speeds, or lost e-mail, but, geez, it’s the Internet!

Ten years ago most of you were still buying magazines, and renting videos, and going to the post office, and ordering things from the Sears catalogue. The only thing cooler would be the ability to teleport ourselves through it.

Look at a map of the Internet sometime and you’ll see that it is like a million superhighways with no lines painted on the road. It’s a snake pit of computers attaching to modems attaching to phone lines, or cable, or satellites, or cell networks, attaching to more computers, servers, routers and modems and so on, and so on. There is no beginning. There is no end.

In the image above, you are looking at one very small part of the Internet. See that star-burst like image it is extracted from? Go take a look at the full image. It takes awhile to load. Then come back, of course.

What makes the Internet work at all, is something called the Internet Protocol (IP). You may have heard of the term IP Address. Now you know what the IP stands for, but do you know what it is? A protocol is a set method for a way of doing things. Think of an incoming phone call. Typically it goes like this: you hear the phone ring, you pick up, you say “Hello…” and maybe a little more like, “…this is Guy speaking.” Then the person on the other end acknowledges you with something like, “Hey Guy, this is work. Where the heck are you?” Then the lying, I mean conversation, begins. That’s a socially accepted phone call protocol.

That’s basically how the Internet works. You tell your computer to connect to a resource, let’s say MakeUseOf.com. Just pulled that out of my hat. MakeUseOf.com is a human readable form for the IP address 216.92.56.91. Who’s going to remember that? Exactly.

So we have something called a Universal Resource Locator (URL) like MakeUseOf.com. Something called a Domain Name Server (DNS) which looks up that URL and then figures out the IP address associated with it. Think of a REALLY big phone book. You look up your plumber’s name and then you figure out what his phone number is. Same deal. Makes sense so far? Relax, there is no quiz and your Internet Users License won’t be revoked.

What the above image shows is the available IP version 4 (IPv4) space. MakeUseOf.com is located in the 216 block. Remember that from the first 3 digits of the IP address? That block belongs to ARIN - American Registry for Internet Numbers. Kind of like how the area code 403 belongs to Alberta. Got’er figured?

Here’s where it gets a little crazy. Each piece of data you send out is broken down into packets. Imagine mailing your friend a book, page by page. Each page will have to carry your friend’s address and the page number to let him know what order it goes in. It should also let him know how many pages there are, so he knows when he has it all. They should also have your address, so if the mail person can’t deliver it, they know where it came from.

So, each packet carries the intended IP address, a number to determine where the packet fits back into the data sent, how many packets to expect, as well as your IP address. Crazy huh? It has more than that, but that’s the really important stuff. Check it out in the packet header below. I highlighted the stuff we talked about in green.

Now, check this out. Each packet doesn’t necessarily go down the same set of wires to its destination. “What kind of glue are you on, Guy?” No, it’s true. Those packets go out to a device called a router, which then sends the packet to the nearest available router that is closer to that destination, and, hopefully, isn’t too congested. It figures that out based on the numbers in your IP address. The first three numbers identify a large area, and the rest make it more specific. Yet again, just like a phone number. This is known as ‘best-effort-delivery’.

So one packet may get routed through Virginia and another may go through Vancouver on their way to the same server in Hong Kong. This also means that packet A might get there later than packet B, or not at all! See what I mean about the miracle of a working Internet?

When the packets arrive at the destination, the server or computer receiving it compiles it into something cohesive, or it puts the book back together, to carry on that metaphor. Now the computer receiving all the packets sends back a message to the originating computer to say, in effect, “Thanks! Good-bye.” Thus the communication ends.

That’s the simplest, high-level overview I can give on how the Internet works. Take what I’ve said and add in millions of servers, routers, modems, and other networking devices and you can see how the complexity is magnified exponentially.

Next time you get an error message or a page loads a little slower than normal, reflect on this article and relive the amazement that the thing works at all. It’s all perspective, my friends. And lots of wires.

The History of Internet in a Nutshell (Author: Cameron Chapman)

Source: http://www.stumbleupon.com/su/1Zi9Aj/sixrevisions.com/resources/the-history-of-the-internet-in-a-nutshell

(Information stored here for personal use)

If you’re reading this article, it’s likely that you spend a fair amount of time online. However, considering how much of an influence the Internet has in our daily lives, how many of us actually know the story of how it got its start?

Here’s a brief history of the Internet, including important dates, people, projects, sites, and other information that should give you at least a partial picture of what this thing we call the Internet really is, and where it came from.

While the complete history of the Internet could easily fill a few books, this article should familiarize you with key milestones and events related to the growth and evolution of the Internet between 1969 to 2009.

1969: Arpanet

Arpanet was the first real network to run on packet switching technology (new at the time). On the October 29, 1969, computers at Stanford and UCLA connected for the first time. In effect, they were the first hosts on what would one day become the Internet.

The first message sent across the network was supposed to be "Login", but reportedly, the link between the two colleges crashed on the letter "g".

1969: Unix

Another major milestone during the 60’s was the inception of Unix: the operating system whose design heavily influenced that of Linux and FreeBSD (the operating systems most popular in today’s web servers/web hosting services).

1970: Arpanet network

An Arpanet network was established between Harvard, MIT, and BBN (the company that created the "interface message processor" computers used to connect to the network) in 1970.

1971: Email

Email was first developed in 1971 by Ray Tomlinson, who also made the decision to use the "@" symbol to separate the user name from the computer name (which later on became the domain name).

1971: Project Gutenberg and eBooks

One of the most impressive developments of 1971 was the start of Project Gutenberg. Project Gutenberg, for those unfamiliar with the site, is a global effort to make books and documents in the public domain available electronically–for free–in a variety of eBook and electronic formats.

It began when Michael Hart gained access to a large block of computing time and came to the realization that the future of computers wasn’t in computing itself, but in the storage, retrieval and searching of information that, at the time, was only contained in libraries. He manually typed (no OCR at the time) the "Declaration of Independence" and launched Project Gutenberg to make information contained in books widely available in electronic form. In effect, this was the birth of the eBook.

1972: CYCLADES

France began its own Arpanet-like project in 1972, called CYCLADES. While Cyclades was eventually shut down, it did pioneer a key idea: the host computer should be responsible for data transmission rather than the network itself.

1973: The first trans-Atlantic connection and the popularity of emailing

Arpanet made its first trans-Atlantic connection in 1973, with the University College of London. During the same year, email accounted for 75% of all Arpanet network activity.

1974: The beginning of TCP/IP

1974 was a breakthrough year. A proposal was published to link Arpa-like networks together into a so-called "inter-network", which would have no central control and would work around a transmission control protocol (which eventually became TCP/IP).

1975: The email client

With the popularity of emailing, the first modern email program was developed by John Vittal, a programmer at the University of Southern California in 1975. The biggest technological advance this program (called MSG) made was the addition of "Reply" and "Forward" functionality.

1977: The PC modem

1977 was a big year for the development of the Internet as we know it today. It’s the year the first PC modem, developed by Dennis Hayes and Dale Heatherington, was introduced and initially sold to computer hobbyists.

1978: The Bulletin Board System (BBS)

The first bulletin board system (BBS) was developed during a blizzard in Chicago in 1978.

1978: Spam is born

1978 is also the year that brought the first unsolicited commercial email message (later known as spam), sent out to 600 California Arpanet users by Gary Thuerk.

1979: MUD – The earliest form of multiplayer games

The precursor to World of Warcraft and Second Life was developed in 1979, and was called MUD (short for MultiUser Dungeon). MUDs were entirely text-based virtual worlds, combining elements of role-playing games, interactive, fiction, and online chat.

1979: Usenet

1979 also ushered into the scene: Usenet, created by two graduate students. Usenet was an internet-based discussion system, allowing people from around the globe to converse about the same topics by posting public messages categorized by newsgroups.

1980: ENQUIRE software

The European Organization for Nuclear Research (better known as CERN) launched ENQUIRE (written by Tim Berners-Lee), a hypertext program that allowed scientists at the particle physics lab to keep track of people, software, and projects using hypertext (hyperlinks).

1982: The first emoticon

While many people credit Kevin MacKenzie with the invention of the emoticon in 1979, it was Scott Fahlman in 1982 who proposed using :-) after a joke, rather than the original -) proposed by MacKenzie. The modern emoticon was born.

1983: Arpanet computers switch over to TCP/IP

January 1, 1983 was the deadline for Arpanet computers to switch over to the TCP/IP protocols developed by Vinton Cerf. A few hundred computers were affected by the switch. The name server was also developed in ‘83.

1984: Domain Name System (DNS)

The domain name system was created in 1984 along with the first Domain Name Servers (DNS). The domain name system was important in that it made addresses on the Internet more human-friendly compared to its numerical IP address counterparts. DNS servers allowed Internet users to type in an easy-to-remember domain name and then converted it to the IP address automatically.

1985: Virtual communities

1985 brought the development of The WELL (short for Whole Earth ‘Lectronic Link), one of the oldest virtual communities still in operation. It was developed by Stewart Brand and Larry Brilliant in February of ‘85. It started out as a community of the readers and writers of the Whole Earth Review and was an open but "remarkably literate and uninhibited intellectual gathering". Wired Magazine once called The Well "The most influential online community in the world."

1986: Protocol wars

The so-called Protocol wars began in 1986. European countries at that time were pursuing the Open Systems Interconnection (OSI), while the United States was using the Internet/Arpanet protocol, which eventually won out.

1987: The Internet grows

By 1987, there were nearly 30,000 hosts on the Internet. The original Arpanet protocol had been limited to 1,000 hosts, but the adoption of the TCP/IP standard made larger numbers of hosts possible.

1988: IRC – Internet Relay Chat

Also in 1988, Internet Relay Chat (IRC) was first deployed, paving the way for real-time chat and the instant messaging programs we use today.

1988: First major malicious internet-based attack

One of the first major Internet worms was released in 1988. Referred to as "The Morris Worm", it was written by Robert Tappan Morris and caused major interruptions across large parts of the Internet.

1989: AOL is launched

When Apple pulled out of the AppleLink program in 1989, the project was renamed and America Online was born. AOL, still in existence today, later on made the Internet popular amongst the average internet users.

1989: The proposal for the World Wide Web

1989 also brought about the proposal for the World Wide Web, written by Tim Berners-Lee. It was originally published in the March issue of MacWorld, and then redistributed in May 1990. It was written to persuade CERN that a global hypertext system was in CERN’s best interest. It was originally called "Mesh"; the term "World Wide Web" was coined while Berners-Lee was writing the code in 1990.

1990: First commercial dial-up ISP

1990 also brought about the first commercial dial-up Internet provider, The World. The same year, Arpanet ceased to exist.

1990: World Wide Web protocols finished

The code for the World Wide Web was written by Tim Berners-Lee, based on his proposal from the year before, along with the standards for HTML, HTTP, and URLs.

1991: First web page created

1991 brought some major innovations to the world of the Internet. The first web page was created and, much like the first email explained what email was, its purpose was to explain what the World Wide Web was.

1991: First content-based search protocol

Also in the same year, the first search protocol that examined file contents instead of just file names was launched, called Gopher.

1991: MP3 becomes a standard

Also, the MP3 file format was accepted as a standard in 1991. MP3 files, being highly compressed, later become a popular file format to share songs and entire albums via the internet.

1991: The first webcam

One of the more interesting developments of this era, though, was the first webcam. It was deployed at a Cambridge University computer lab, and its sole purpose was to monitor a particular coffee maker so that lab users could avoid wasted trips to an empty coffee pot.

1993: Mosaic – first graphical web browser for the general public

The first widely downloaded Internet browser, Mosaic, was released in 1993. While Mosaic wasn’t the first web browser, it is considered the first browser to make the Internet easily accessible to non-techies.

1993: Governments join in on the fun

In 1993, both the White House and the United Nations came online, marking the beginning of the .gov and .org domain names.

1994: Netscape Navigator

Mosaic’s first big competitor, Netscape Navigator, was released the year following (1994).

1995: Commercialization of the internet

1995 is often considered the first year the web became commercialized. While there were commercial enterprises online prior to ‘95, there were a few key developments that happened that year. First, SSL (Secure Sockets Layer) encryption was developed by Netscape, making it safer to conduct financial transactions (like credit card payments) online.

In addition, two major online businesses got their start the same year. The first sale on "Echo Bay" was made that year. Echo Bay later became eBay. Amazon.com also started in 1995, though it didn’t turn a profit for six years, until 2001.

1995: Geocities, the Vatican goes online, and JavaScript

Other major developments that year included the launch of Geocities (which officially closed down on October 26, 2009).

The Vatican also went online for the first time.

Java and JavaScript (originally called LiveScript by its creator, Brendan Eich, and deployed as part of the Netscape Navigator browser – see comments for explanation) was first introduced to the public in 1995. ActiveX was launched by Microsoft the following year.

1996: First web-based (webmail) service

In 1996, HoTMaiL (the capitalized letters are an homage to HTML), the first webmail service, was launched.

1997: The term "weblog" is coined

While the first blogs had been around for a few years in one form or another, 1997 was the first year the term "weblog" was used.

1998: First new story to be broken online instead of traditional media

In 1998, the first major news story to be broken online was the Bill Clinton/Monica Lewinsky scandal (also referred to as "Monicagate" among other nicknames), which was posted on The Drudge Report after Newsweek killed the story.

1998: Google!

Google went live in 1998, revolutionizing the way in which people find information online.

1998: Internet-based file-sharing gets its roots

In 1998 as well, Napster launched, opening up the gates to mainstream file-sharing of audio files over the internet.

1999: SETI@home project

1999 is the year when one of the more interesting projects ever brought online: the SETI@home project, launched. The project has created the equivalent of a giant supercomputer by harnessing the computing power of more than 3 million computers worldwide, using their processors whenever the screensaver comes on, indicating that the computer is idle. The program analyzes radio telescope data to look for signs of extraterrestrial intelligence.

2000: The bubble bursts

2000 was the year of the dotcom collapse, resulting in huge losses for legions of investors. Hundreds of companies closed, some of which had never turned a profit for their investors. The NASDAQ, which listed a large number of tech companies affected by the bubble, peaked at over 5,000, then lost 10% of its value in a single day, and finally hit bottom in October of 2002.

2001: Wikipedia is launched

With the dotcom collapse still going strong, Wikipedia launched in 2001, one of the websites that paved the way for collective web content generation/social media.

2003: VoIP goes mainstream

In 2003: Skype is released to the public, giving a user-friendly interface to Voice over IP calling.

2003: MySpace becomes the most popular social network

Also in 2003, MySpace opens up its doors. It later grew to be the most popular social network at one time (thought it has since been overtaken by Facebook).

2003: CAN-SPAM Act puts a lid on unsolicited emails

Another major advance in 2003 was the signing of the Controlling the Assault of Non-Solicited Pornography and Marketing Act of 2003, better known as the CAN-SPAM Act.

2004: Web 2.0

Though coined in 1999 by Darcy DiNucci, the term "Web 2.0", referring to websites and Rich Internet Applications (RIA) that are highly interactive and user-driven became popular around 2004. During the first Web 2.0 conference, John Batelle and Tim O’Reilly described the concept of "the Web as a Platform": software applications built to take advantage of internet connectivity, moving away from the desktop (which has downsides such as operating system dependency and lack of interoperability).

2004: Social Media and Digg

The term "social media", believed to be first used by Chris Sharpley, was coined in the same year that "Web 2.0" became a mainstream concept. Social media–sites and web applications that allow its users to create and share content and to connect with one another–started around this period.

Digg, a social news site, launched on November of 2004, paving the way for sites such as Reddit, Mixx, and Yahoo! Buzz. Digg revolutionized traditional means of generating and finding web content, democratically promoting news and web links that are reviewed and voted on by a community.

2004: "The" Facebook open to college students

Facebook launched in 2004, though at the time it was only open to college students and was called "The Facebook"; later on, "The" was dropped from the name, though the URL http://www.thefacebook.com still works.

2005: YouTube – streaming video for the masses

YouTube launched in 2005, bringing free online video hosting and sharing to the masses.

2006: Twitter gets twittering

Twitter launched in 2006. It was originally going to be called twittr (inspired by Flickr); the first Twitter message was "just setting up my twttr".

2007: Major move to place TV shows online

Hulu was first launched in 2007, a joint venture between ABC, NBC, and Fox to make popular TV shows available to watch online.

2007: The iPhone and the Mobile Web

The biggest innovation of 2007 was almost certainly the iPhone, which was almost wholly responsible for renewed interest in mobile web applications and design.

2008: "Internet Election"

The first "Internet election" took place in 2008 with the U.S. Presidential election. It was the first year that national candidates took full advantage of all the Internet had to offer. Hillary Clinton jumped on board early with YouTube campaign videos. Virtually every candidate had a Facebook page or a Twitter feed, or both.

Ron Paul set a new fundraising record by raising $4.3 million in a single day through online donations, and then beat his own record only weeks later by raising $4.4 million in a single day.

The 2008 elections placed the Internet squarely at the forefront of politics and campaigning, a trend that is unlikely to change any time in the near future.

2009: ICANN policy changes

2009 brought about one of the biggest changes to come to the Internet in a long time when the U.S. relaxed its control over ICANN, the official naming body of the Internet (they’re the organization in charge of registering domain names).

The Future?

Where is the future of the Internet headed? Share your opinions in the comments section.

Sources and Further Reading

• A People’s History of the Internet: from Arpanet in 1969 to Today: A timeline of the Internet from guardian.co.uk.
• History of the Internet: An early timeline of the Internet, from precursors in the 1800s up through 1997.
• A Brief History of the Web: A series of videos from Microsoft to celebrate the launch of Internet Explorer 8.
• The History of the Internet – Tim Berners-Lee: A brief history of major developments associated with the Internet from About.com.
• Hobbes’ Internet Timeline – the definitive ARPAnet & Internet History: A very thorough timeline of the Internet, starting in 1957 and going up through 2004, with tons of statistics and source material included.
• Internet Timeline: A basic timeline of Internet history from FactMonster.com.

Related Content

• The History of Web Browsers
• Popular Search Engines in the 90’s: Then and Now
• 10 Revealing Infographics about the Web
• Related categories: Web Development and Infographics

About the Author

Cameron Chapman is a professional web and graphic designer with over 6 years of experience in the industry. She’s also written for numerous blogs such as Smashing Magazine and Mashable. You can find her personal web presence at Cameron Chapman On Writing. If you’d like to connect with her, check her out on Twitter.