IT 10103Introduction to Information Technology

The Internet & World Wide WebBegan in 1969 with the ARPANET(Advanced Research Project Agency Network)

ARPANET3 Goals:Communication between scientists & universitiesMilitary & Government CommunicationsNuclear Proof

The InternetWhat is the Internet?

A World-Wide Collection of Networks (Servers)

The Hardware Part of the Network

The InternetHow do we communicate on the Internet?

IP (Internet Protocol) Addressesxxx.xxx.xxx.xxx

Example: 206.21.59.35

The InternetHow do we connect to the Internet?

Modem (MODdulate/DEModulate)

Analog DeviceConnects through the Phone System (POTS)Limited to 56kbps speeds (56,000 bits per second)

The InternetHow do we connect to the Internet contd?

Network Interface Card (NIC)&Digital Modems (Routers)

DSL (Digital Subscriber Line)CableSatelliteISDN (Integrated Signal Digital Network)

The InternetHow do we get to our websites?

DNS (Domain Name Services) through aDomain Name Server (DNS Server)

Example:www.rio.edu or206.21.59.35

World Wide WebWhat 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 WebHow do we use the www?

Web Browser SoftwareFirefoxInternet ExplorerOperaNetscapeEtc.

World Wide WebHow are documents made on the www?

HTML (Hyper-Text Markup Language)

All web documents are created using the HTML programming language

World Wide WebHow do we find documents on the www?

Web Address:

http://www.rio.edu/StudentLife/Default.htmHyper-Text Transfer ProtocolDomain NamePathDocument

World Wide WebThe HTML Programming Language

Very easy to learn and forms the basis for all web documents

HTML describes how a page should be formatted.

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

The WebHow Fast is the Web?The time needed to download something on the web is determined by four factors:The size of the web pageThe speed of the users internet connectionThe speed of the web serverThe amount of traffic competing for use of the internet

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

Internet & WWWWhat makes all of this work?

A Network ProtocolTCP/IPTransfer Control Protocol/Internet Protocol

Allows communication between the Internet Servers and the Web Browsers on Client computers

Internet & WWWWhat is the most used part of the Internet?

E-Mail(Electronic Mail)

Billions of messages are transferred each day

Internet & WWWWhy do I care about all of this?Answers:We are in IT 10103 Prof.Dah!We want to Pass this CourseWe like to Strain our BrainsI Paids my Muney, so I wants my Edumakation

Internet & WWWQUESTIONS?

Internet & WWWAssignment 01Page 129Research Web Exercise #2