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Chapter 3

CIS 1200 Chapter Notes - Chapter 3: Web 2.0, Dot-Decimal Notation, Yelp


Department
Computing and Information Science
Course Code
CIS 1200
Professor
John Saville
Chapter
3

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The Internet and How it Works
Origin of Internet
Concept developed in late 1950s in midst of the Cold War, US Department of Defense needed a
computer network that wouldn’t be disrupted easily in the event of an attack
At same time researchers for the Department of Defense were trying to get different computers to
communicate with each other
Internet established to respond to these two concerns
Establishing a secure form of communications and creating a means by which all computers
could communicate
Internet evolved from an early US government – funding “internetworking” project called the
Advanced Research Projects Agency Network (ARPANET)
Web vs Internet
The web is a subset of the Internet dedicated to broadcasting HTML pages and how we access info
over the Internet
Web is based on Hypertext Transfer Protocol (HTTP)
What distinguishes the web from the rest of the Internet is its use of the following:
Common communications protocols that enable computers to talk to each other and display
information in compatible formats
Special links that enable users to navigate from one place to another on the web
Web Browser – software that lets you display and interact with text and other media on the
web
History of the web
Based on a protocol developed by someone who wanted a method for linking his research
documents so others could access them
Original browser could only handle text
1993 the Mosaic browser could display graphics and text
The Netscape Navigator evolved from Mosaic and thus started the beginning of the web’s
monumental growth
How Internet Works

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All devices connected to the Internet create a network of networks, they connect with each other in
turns
A computer is either a client (asks for data) or a server (receives the request and returns data
to the client)
The request travels along transmission lines, the fastest ones called Internet Backbones
Internet Protocol (IP) Address: each time you connect to the Internet your computer is
assigned a unique identification number
A set of four numbers separated by periods (123.45.245.91)
Referred to as dotted quad or dotted decimal
The means by which computers connected to the Internet identify with each other
Each website is assigned a IP address along with a text version that is easier to remember
(www.amazon.com and 721.21.211.176 are the same thing)
Communicating and Collaborating On the Web
Web 1.0: passively browsing web pages that were created for us
Web 2.0: actively creating our own web content and sharing and collaborating on it with others
Classified as social web which users are also participants
Collaborate through applications like Google Docs, rate and recommend products on Yelp, tag a
friend on social networks like Facebook, or share a video on YouTube. (Social Media)
Social Networking: using the web to communicate and shar information among your friends
and others
Social networking used in business:
Can help meet other professionals through the people you already know
LinkedIn helps to find potential clients, business opportunities, jobs, or job candidates
Used for marketing and communicating directly with customers
Dos and Don’ts of Social Networking
Keep personal information personal. (birth year, address, routines of life – sports games, work
schedules)
Know who your friends are and who can see the info you post
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