1. Computer Concepts – Illustrated 8th edition
Unit E: Networks and Connecting to the Internet

2. Objectives Introduce networks Explore network hardware
Compare wireless and wired technology
Set up a network
Access network resources
Computer Concepts – Illustrated 8th Edition
Computer Concepts – Illustrated 8th Edition 2

3. Objectives (continued)
Introduce Internet technology
Connect to the Internet with wires
Connect to the Internet wirelessly
Explore IP addresses and domain names
Computer Concepts – Illustrated 8th Edition
Computer Concepts – Illustrated 8th Edition 3

4. Introducing Networks Computer network
Combination of hardware, software, cables, and signals that:
Transport data
Allow computers to communicate with each other and other electronic devices
Computer Concepts – Illustrated 8th Edition
Computer Concepts – Illustrated 8th Edition 4

5. Introducing Networks (continued)
Sharing networked hardware can:
Reduce costs
Expand access
Sharing networked software can:
Facilitate data sharing
Enable collaboration
Computer Concepts – Illustrated 8th Edition

6. Introducing Networks (continued)
Disadvantages of networks:
Vulnerability to unauthorized access
Vulnerability to malicious code
Types of networks:
PAN (personal area network)
LAN (local area network)
NAN (neighborhood area network)
MAN (metropolitan area network)
WAN (wide area network)
Computer Concepts – Illustrated 8th Edition

7. Exploring Network Hardware
Client/server network
Server computer provides services and resources to client computers
Peer-to-peer (P2P) networks
Do not have a server
Figure E-4: Structure of a client/server network
Computer Concepts – Illustrated 8th Edition

8. Exploring Network Hardware (continued)
Network devices include:
Modem
Network hub
Network switch
Network router
Network interface card (NIC)
Required by devices to connect to a network
Ethernet card
Also called an Ethernet adapter or NIC
A NIC that supports Ethernet protocols
Computer Concepts – Illustrated 8th Edition

9. Comparing Wireless and Wired Technology
Wired network
Data travels over cables
More secure
Offers faster speeds
Wireless network
Data travels through the air
Offers mobility
Wi-Fi card: a wireless NIC
Wireless access point: device that transmits and receives wireless signals
Computer Concepts – Illustrated 8th Edition

10. Figure E-9: Wi-Fi equipment
Computer Concepts – Illustrated 8th Edition

11. Comparing Wireless and Wired Technology (continued)
Wireless router: wireless access point that includes circuitry to connect a Wi-Fi network to the Internet
Wi-Fi (Wireless Fidelity): most popular wireless LAN technology
Wireless networks use:
RF (radio frequency) signals
Microwave signals
Infrared signals
Computer Concepts – Illustrated 8th Edition

12. Setting Up a Network Setting up an Ethernet network
It is easy to install a wired network
Setting up a wireless network
Place wireless router in a central location
Set up the router
Connect to the router with a computer
Configure the router
Access the router setup utility
Create a new router password
Computer Concepts – Illustrated 8th Edition

13. Setting Up a Network (continued)
Setting up a wireless network (continued)
Enter an SSID (service set identifier)
Activate security and create an encryption key
Set up the wireless workstations
Connect an Internet access device
Computer Concepts – Illustrated 8th Edition

14. Figure E-14: Basic configuration for a combined wired and wireless network
Computer Concepts – Illustrated 8th Edition

15. Accessing Network Resources
Windows automatically detects networks
You can also click the workgroup name to access a workgroup
Adding computers to a wireless network
When SSID broadcasting is turned on, you can easily find the network
Number of ways available to access shared resources on other network computers
Computer Concepts – Illustrated 8th Edition

16. Accessing Network Resources (continued)
Drive mapping
Assigns a drive letter to a storage device located on a network computer
File Sharing dialog box
Used to allow other network users to access files or folders on a Windows computer
To share a printer over a network:
If using Windows, enable printer sharing using the Windows Control Panel
Connect a printer in one of three ways
Computer Concepts – Illustrated 8th Edition

17. Figure E-18: Ways of connecting a printer to a network
Computer Concepts – Illustrated 8th Edition

18. Introducing Internet Technology
Network service providers (NSPs)
Maintain Internet backbone links and routers
ISP (Internet service provider)
Connects computers to Internet or an NSP
Bandwidth determines how fast data travels over a network
Broadband: cable TV, DSL
Narrowband: dial-up Internet access
Upstream speed
Downstream speed
Computer Concepts – Illustrated 8th Edition

19. Figure E-19: Connecting your computer to the Internet
Computer Concepts – Illustrated 8th Edition

20. Introducing Internet Technology (continued)
TCP/IP
Protocol that regulates Internet data transport
A standard for LANs and WANs
TCP (Transmission Control Protocol)
IP (Internet Protocol)
Connection options
Fixed Internet access
Portable Internet access
Mobile Internet access
Computer Concepts – Illustrated 8th Edition

21. Connecting to the Internet with Wires
Dial-up connection
Data carried over telephone call circuit
Voiceband modem (or modem): converts digital signals from a computer into analog signals
Figure E-22: Connect using phone lines
Computer Concepts – Illustrated 8th Edition

22. Connecting to the Internet with Wires (continued)
DSL (digital subscriber line)
High-speed, digital, always-on
Uses standard phone lines to transport data
Figure E-24: Connect using DSL
Computer Concepts – Illustrated 8th Edition

23. Connecting to the Internet with Wires (continued)
Cable Internet connection
Always-on broadband Internet access
Uses the infrastructure of cable television service
Figure E-26: Connect using cable TV
Computer Concepts – Illustrated 8th Edition

24. Connecting to the Internet Wirelessly
Satellite Internet service
Always-on, high-speed, and asymmetric Internet access
Figure E-27: Connect using satellite
Computer Concepts – Illustrated 8th Edition

25. Connecting to the Internet Wirelessly (continued)
Fixed wireless Internet service
Offers Internet access by broadcasting data signals over large areas
WiMAX: Ethernet-compatible network standard
Public Wi-Fi network: wireless LAN that provides open Internet access to the public
WAP (Wireless Access Protocol): provides wireless Internet access from handheld devices
Computer Concepts – Illustrated 8th Edition

26. Exploring IP Addresses and Domain Names
Used to identify a computer while it is connected to the Internet
Example:
Static IP address: permanently assigned
Dynamic IP address: temporary
Domain name
Every domain name corresponds to a unique IP address
Ends with an extension that indicates its top-level domain
Computer Concepts – Illustrated 8th Edition

27. Figure E-32: Network Connection Details
Computer Concepts – Illustrated 8th Edition

28. Figure E-33: How domain names work
Computer Concepts – Illustrated 8th Edition

29. Talking Points: Why Pay for Internet Access if You Can Get It for Free?
Is free Internet access always legal?
Data security
Hackers can use unprotected wireless systems to steal financial information, download child pornography, etc.
Unregulated network availability raises ethical, security, and privacy issues
Free WLAN controversy
Telecommunications giants vs. free WLAN advocates
Computer Concepts – Illustrated 8th Edition

30. Summary This chapter introduced: Computer networks Network hardware
Setting up a network
Accessing network resources
Technologies behind the Internet
Options for connecting to the Internet
Implications of free Wi-Fi technology and free Internet access to the public
Computer Concepts – Illustrated 8th Edition