1. CMPE 101 Introduction to Information Technologies* *
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CMPE 101 Introduction to Information Technologies
Chapter 6: The Internet and the World Wide Web
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2. Objectives Define the Internet, and explain how it works.* *
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Define the Internet, and explain how it works.
Describe methods for accessing the Internet.
Differentiate between the Internet and the World Wide Web, and describe the elements that enable Web content to be displayed.
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3. Objectives * *
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Describe several methods of finding information on the Web including the use of a URL, surfing, conducting searches, and sharing with other Web users through social networks.
Identify features to look for when evaluating a Web site or its content.
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4. Objectives * *
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List the most popular Internet services, and explain what they do.
List safe surfing procedures, and identify hazards of the Web.
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5. What Is the Internet and How Does It Work?* *
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Internet
Global system of computers of thousands of privately and publicly owned computers and networks
Also known as the Net
Started in the 1960s
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6. What Is the Internet and How Does It Work?* *
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Internet—composed of more than 750 million hosts (?)
Host—computer that has two-way access to other computers:
Receives requests
Replies to those requests
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7. What Is the Internet and How Does It Work?* *
What Is the Internet and How Does It Work?
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Volunteers maintain the Internet networks.
Private and public groups provide the equipment.
Network service providers (NSPs)
Maintain the Internet backbone—the main high-speed routes
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8. * *
How Does Internet Work?
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9. Accessing the Internet: Going Online* *
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Internet service providers (ISPs)
Supply and sustain user connections to the Internet
Maintain the hardware and software
Protect their sites and networks from outside threats
Examples:
TTNET
Turkcell Superonline
Turksat Uydunet
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10. Accessing the Internet: Going Online* *
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Wireless Internet service provider
Company that provides wireless Internet access
Example: TTNET WiFi
Hot spot
Public location that provides Internet access for wireless devices
Examples: airport, college campus, or coffee shop
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11. Accessing the Internet: Going Online* *
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Methods to access the Internet
Dial-up access—uses modem and telephone line
Digital subscriber line (DSL)—high-speed—uses modem and telephone lines
Cable access—high-speed—cable modem over cable TV line
Satellite—high-speed Internet service, not for home use
Fiber-optic service—high-speed Internet—fiber-optic lines
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12. Accessing the Internet* *
Accessing the Internet
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Phone cable - Dialup
Ethernet cable - DSL
Fiber optic
Coaxial - Cable
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13. The Internet and the Web: What's the Difference?* *
The Internet and the Web: What's the Difference?
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14. The Internet and the Web: What's the Difference?* *
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Web contains the information.
Internet transports information to and from users.
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15. The Internet and the Web: How Do You See a Web Page* *
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Click to add notes *
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16. The Internet and the Web: Anatomy of a Web Page*
The Internet and the Web: Anatomy of a Web Page *
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Hypertext
Uses links to connect to additional related information
Hyperlinks or links
Words and images that bring other documents into view when clicked
Hypertext Markup Language (HTML)
Uses tags to specify how a Web page should display
Extensible Hypertext Markup Language (XHTML)
HTML combined with Extensible Markup Language (XML) to reduce the complexity of HTML *
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17. Browser Wars * *
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18. Web Servers Web servers* *
Web Servers
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Web servers
Web sites and their associated information are stored here
Used to recognize information requests, process the requests, and send the requested documents
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19. Finding Information on the Web* *
Finding Information on the Web
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Internet Protocol (IP) address
Every device on the Internet has a unique network identifier
Consists of 4 numbers between 0-255
Uniform Resource Locator (URL)
Identifies Internet resource’s type and location
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20. URL http://domain_name/path/resource_name* *
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21. Finding Information on the Web* *
Finding Information on the Web
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Downloading
Process of transferring a file or document from one computer to user’s computer
Uploading
Process of transferring a file or document from user’s computer to another computer
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22. Using Information from the Web*
Using Information from the Web *
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Evaluate information obtained from the Web:
Who is author?
Does the author reference sources?
Who is the Web page affiliated with? Who pays for it?
Is the language objective/dispassionate or strident/argumentative?
What is the purpose of the page?
Does the information appear to be accurate?
Is the page current? *
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23. Using Information from the Web*
Using Information from the Web *
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Use Web information for schoolwork.
Access authoritative online sources.
Locate published works.
Provide appropriate online and offline reference citations in your work. *
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24. Exploring Internet Services*
Exploring Internet Services *
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Electronic mail ( )
Type of application software that makes sending and receiving messages through computer networks possible
attachment
Computer file included with an message
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25. Exploring Internet Services* *
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address
Unique cyberspace address for each individual
Consists of a user name, the name of the hosting service, and the top-level domain
Spam
Unsolicited s, usually from advertisers
Do not open spam
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26. Exploring Internet Services* *
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VoIP (Voice over Internet Protocol)
Users can speak to others over a broadband Internet connection instead of an analog phone line
A VoIP service provider such as Skype
Calls are usually free to others using the same service.
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27. E-Commerce Online shopping Shop for good deals* *
E-Commerce
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Online shopping
Shop for good deals
Use shopping portals to compare prices and products
Example: PriceGrabber.com
Look for coupons and rebates
Click to add notes *
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28. Safe Surfing Guidelines for safe surfing*
Safe Surfing *
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Guidelines for safe surfing
Never give out identifying information.
Never respond to suggestive messages.
Never open from an unknown source.
Never allow a child to make arrangements for a face-to-face meeting alone.
Remember individuals online may not be who they claim to be.
Set reasonable rules and guidelines for computer use by children.
Make using the computer a family activity.
Click to add notes *
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