1. Chapter 7 Connecting to the Internet

2. Practical PC 5th Edition Chapter 7
Getting Started
In this Chapter, you will learn:
What is the Internet
Options for Internet service
What is an IP address
How to avoid online intrusions
About Hardware: Wired and wireless network devices
Practical PC 5th Edition Chapter 7

3. Practical PC 5th Edition Chapter 7
What is the Internet?
The Internet is the largest computer network
A computer network is a collection of computers and devices linked to share data, hardware, and software
Data is exchanged using TCP/IP, which is a protocol that divides information into packets of data
The Internet backbone is a network of high-capacity communication links maintained and accessed by:
Network service providers (NSPs)
Network access points (NAPs)
Internet service providers (ISPs)
The computer you use to access the Internet is the client computer. Typically you will connect to the Internet using a modem
Practical PC 5th Edition Chapter 7

4. Practical PC 5th Edition Chapter 7
What is the Internet?
Diagram of Internet Connection
Practical PC 5th Edition Chapter 7

5. What are the options for Internet service?
Internet services vary in cost, speed, and reliability
Costs range from U.S. $10 to $100/month
Speeds range from 56 Kbps to 6 Mbps
Connection types
Symmetrical connections provide the same downstream and upstream data speeds
Asymmetrical connections are the most popular and have faster downstream data speeds
Losing your Internet connection is frustrating
Cable connections are very reliable
Wireless connections are not as reliable but are convenient when you are on the go
Practical PC 5th Edition Chapter 7

6. What are the options for Internet service?
Cable Internet service
Uses same infrastructure as cable television
Offers fastest access speeds
Uses a cable modem
DSL (digital subscriber line)
Runs over standard phone lines
Offers one of the fastest connections available to individuals
Dial-up Internet service
Uses a voiceband modem and telephone lines
Typically less than $10/month
Access speed is slow
Practical PC 5th Edition Chapter 7

7. What are the options for Internet service?
Satellite Internet service
Distributes access via a personal satellite dish
In rural areas may be only choice other than dial-up
Susceptible to bad weather and slow signal time
WiMax
Newest technology, limited availability
Transmits data to nearby communication tower
Mobile broadband
Access to the Internet is through high-speed cellular technology
Used for PDAs, smartphones, notebooks
Can have slower speeds, dropped connections
Practical PC 5th Edition Chapter 7

8. Practical PC 5th Edition Chapter 7
What’s an IP address?
Every device has an IP address that identifies it
IP addresses such as are divided by periods into four segments called octets
Static IP addresses are permanently assigned and are used by ISPs and Web sites that need to be found at the same address
Dynamic IP address are used by most other users and are temporarily assigned by your ISP
Dial-up users get a new IP every time
DSL/Cable users have an always-on connection with the IP address remaining the same for days, weeks, or months
Through geolocation, your IP address indicates the general region of the world where your computer resides
Practical PC 5th Edition Chapter 7

9. Practical PC 5th Edition Chapter 7
What’s an IP address?
You can check your IP address
Practical PC 5th Edition Chapter 7

10. How do I avoid online intrusions?
An intrusion is any access to data or programs by hackers, criminals, or other unauthorized persons
Access can be gained through an open port. A port is any pathway of data in or out of a computer
Port scanning software looks for unprotected computers and can attack an unprotected computer within 9 minutes
To protect your computer:
Use online tools to check for open ports
Shut down your computer when not in use
Download operating system security patches
Use personal firewall software
Practical PC 5th Edition Chapter 7

11. Hardware: Wired and wireless network devices
The Internet connects many smaller networks sometimes called local area networks (LANs)
Connect computers, printers and scanners at school, work, and home
Most popular technologies are Ethernet and Wi-Fi
Ethernet
Wired network technology
Most computers include Ethernet port
Connections are fast, inexpensive, reliable, and fairly secure
Practical PC 5th Edition Chapter 7

12. Hardware: Wired and wireless network devices
Ethernet port
Practical PC 5th Edition Chapter 7

13. Hardware: Wired and wireless network devices
Wi-Fi
Wireless networking technology uses radio waves
Equipment widely available and fairly affordable
Main advantage is mobility
Security provided by Wireless encryption
Router is centerpiece of LANs
Support both wired and wireless devices
Controls flow of data
Use as a security device to assign private IP addresses through network address translation
Practical PC 5th Edition Chapter 7

14. Hardware: Wired and wireless network devices
Diagram of LAN connected to router
Practical PC 5th Edition Chapter 7

15. Do we need anonymous digital cash?
What do you think?
Have you ever made a purchase from the Internet using a credit card?
Do you think that most people believe that using a credit card in a restaurant is safer than using a credit card on the Internet?
Do you think that anonymous digital cash is a good idea?
Practical PC 5th Edition Chapter 7

16. Practical PC 5th Edition Chapter 7
Chapter Summary
You should now be able to:
Understand what is the Internet
Choose an Internet service option
Understand IP addresses
Avoid online intrusions
Understand wired and wireless network devices
Practical PC 5th Edition Chapter 7