IT 10103 Introduction to Information Technology. The Internet & World Wide Web Began in 1969 with the ARPANET (Advanced Research Project Agency Network)

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Presentation transcript:

IT Introduction to Information Technology

The Internet & World Wide Web Began in 1969 with the ARPANET (Advanced Research Project Agency Network) ARPANET 3 Goals: Communication between scientists & universities Military & Government Communications Nuclear Proof

The Internet What is the Internet? A World-Wide Collection of Networks (Servers) The Hardware Part of the Network

The Internet How do we communicate on the Internet? IP (Internet Protocol) Addresses xxx.xxx.xxx.xxxExample:

The Internet How do we connect to the Internet? Modem (MODdulate/DEModulate) Analog Device Connects through the Phone System (POTS) Limited to 56kbps speeds (56,000 bits per second)

The Internet How do we connect to the Internet cont’d? Network Interface Card (NIC) & Digital Modems (Routers) DSL (Digital Subscriber Line) CableSatellite ISDN (Integrated Signal Digital Network)

The Internet How do we get to our websites? DNS (Domain Name Services) through a Domain Name Server (DNS Server) Example:

World Wide Web What is the World Wide Web (www)? The World-Wide Collection of Documents that reside on the Internet (Servers) The Software Part of the Network

World Wide Web How do we use the www? Web Browser Software Firefox Internet Explorer OperaNetscapeEtc.

World Wide Web How are documents made on the www? HTML (Hyper-Text Markup Language) All web documents are created using the HTML programming language

World Wide Web How do we find documents on the www? Web Address: Hyper-Text Transfer Protocol Domain Name PathDocument

World Wide Web The HTML Programming Language Very easy to learn and forms the basis for all web documents HTML describes how a page should be formatted.

The Web How does the Web work? The web is a collection of networks, starting near your home or office and expanding until we reach the global network

The Web How does the Web work? We type in a URL (Uniform Resource Locator) of a page and our Web Browser contacts the computer (web server) where that address is located (stored).

The Web How does the Web work? The Web Server receives your request and then sends the documents back to us by breaking them into pieces we call Packets

The Web How does the Web work? Packets wander the internet (network) until they finally end up at our computer to be displayed on our computer monitors Packets can be re-routed if there is a breakdown on the path they are traveling or if there is congestion as well

The Web How Fast is the Web? The time needed to download something on the web is determined by four factors: The size of the web page The speed of the users internet connection The speed of the web server The amount of traffic competing for use of the internet

The Web How Fast is the Web? The users internet connection is usually the slowest of these four Improving a users internet connection speed will speed up access to the web the most

Internet & WWW What makes all of this work? A Network Protocol TCP/IP Transfer Control Protocol/Internet Protocol Allows communication between the Internet Servers and the Web Browsers on Client computers

Internet & WWW What is the most used part of the Internet? (Electronic Mail) Billions of messages are transferred each day

Internet & WWW Why do I care about all of this? Answers: We are in IT Prof….Dah! We want to Pass this Course We like to Strain our Brains I Paids my Muney, so I wants my Edumakation

Internet & WWW QUESTIONS?

Assignment 01 Page 129 Research Web Exercise #2