1. Computer Skills and Applications II
Unit 2.00 – The Internet and World Wide Web
Objective 2.01 – The Internet

2. What is the Internet?
The Internet is a collection of networks that are connected together for exchange of Information
When the computer is connected to the Internet, it is said to be “online.”

3. Uses of the Internet Communicate with people around the world.
Messages can reach people around the world in seconds.
Read updates on current events
Leading news channels use the Internet at a medium to provide updated news.
Search for information on any specific topic
Take classes and exams online

4. Uses of the Internet The Internet can be used for entertainment
Listen to music
Play games
Watch movies
Share pictures
Buy and sell products.
One can use a credit card to pay online
E-Commerce

5. Internet Connection Requirements
Items needed to connect to the Internet
A computer or computing device
A connection device (a modem)
An Internet Service Provider (ISP)
Types of Computers:
Personal computer
Portable computer (laptop)
Mobile devices (cell phone or a handheld device)

6. Internet Connection Requirements
Connection Device:
Modem – converts digital information into analog information to be transmitted.
Can be internal or external
Internet Service Provider (ISP)
A company that provides Internet connectivity to
Individuals
businesses and organizations
May also provide additional services
Additional storage space

7. Internet Connection Requirements
Methods used to connect to the Internet:
Cables (Cat 5 wire – Much like a phone line)
This is called a physical connection
Wireless Technology
Wireless Fidelity (Wi-Fi)
Provides wireless communication between a computer and a network
WiFi is not physically connected to an ISP
Access Point (AP) – this is used to connect a wireless computer to a wired network. The wired network belongs to a Internet Service Provider

8. Types of Internet Connections
Dedicated
Dial-Up
Dedicated Internet Connection
Allows computer to be connected to the Internet all the time
Always connected to the ISP
Used by large organizations, universities
Example: T1, DSL, and Cable Modem
More expensive
Dial-Up Connections
Need to request a connection from the ISP when Internet use is wanted
You may disconnect when done using the Internet
Less expensive

9. What is Bandwidth?
Bandwidth is the amount of data that can be transmitted over a network.
Measures by
Mbps (megabits per second)
Kbps (Kilobits per second)
Bps (bits per second)
Rate of transfer of data will depend on
ISP’s equipment
Type of Internet connection
Number of people using the same connection at the same time

10. Internet Connections Dial-Up Digital Subscriber Line (DSL) Cable Modem
Data transfer rates up to 56.6 Kbps
Digital Subscriber Line (DSL)
Always connected to the Internet
Data transfer rates is between 384 kbps to 8Mbps
Asymmetric Digital Subscriber Line (ADLS)
One type of DSL connection
A special modem is needed
Cable Modem
High speed Internet connection from cable TV provider
Data transfer rates of 4 Mbps

11. Internet Connections T1 Line Wireless Provides a dedicate phone line
Popular among businesses
Data transfer rates of Mbps
Wireless
Connects to a modem or T1 line and then connects to an ISP
May not get the full rate of transfer with a wireless connection
Data transfer rates of 11Mbps to 45 Mbps
Some wireless connections may differ