1. Unit 9 Network Fundamentals
Living Online
Unit 9
Network Fundamentals

2. Objectives Describe a network Explain the benefits of a network
Identify risks in computing
Describe the roles of clients & servers
List & describe types of networks
List & describe communications media & hardware
Describe network security

3. Network
2 or more connected devices
Can transfer data

4. Networks Benefits vs. Risks
Benefits: Share information, collaborate, share hardware, share software, communication
Risks: loss of autonomy, malicious code, network faults, setup & management costs, is not private
Benefits
Risks

5. Why Hack? Theft of services Theft of Information Hatred & vengeance
For the thrill of it
Finds a way to get into password protected system to avoid paying for a service.
Steal credit card info, national security data
Some people hate companies or groups, so they try and destroy files or steal info to sell to opposing groups
The thrill is seeing if they can break into it

6. Review T or F. Hackers invade other people’s computers only for fun.
T or F. Software sharing is one of the benefits of networking.
When you are on a network, you should assume that your is not _____________?
Private
T or F. It is easier for a virus to spread on a network.

7. Network Types- Client-Server
Server manages & provides a service to client
Network OS
Username & password
Describe client-server with web page request example. Servers have network OS.
Router or Hub

8. Network Types- Peer to Peer
No server
Small office or house
Easy to set up

9. Network Types- LAN Local Area Network Small geographic area WLAN
Office, school, house
WLAN
Wireless
Need Wi-Fi card

10. Network Types- WAN Wide Area Network Large geographic area
Two or more LANs connected by routers
Big businesses with office around country or world
Internet is biggest WAN
Connected by fiber, satellites, telephone

11. Network Types- Internet
Global network of connected, smaller networks
World Wide Web & are most popular

12. Network Types- Intranet
Web based for internal company use
Handbooks, manuals, employment forms, work news, etc
Only can access from within that company
Through web browser

13. Network Types- Extranet
Similar to Intranet
Outside users with user name & password can have access to internal info

14. Review How is the network at school different than your home one?
How is it the same?
Which type of network has an OS & requires a username/password for access?
Client-server
What are two popular Internet features?
& Web
At BK, you can access the Internet with your laptop & no wires. What type of network is this?
WLAN

15. Communication Hardware- Modem
Dial-Up Modem (Int or Ext)
Modulate-demodulate
Converts analog to digital & reverse
Data over phone lines
Dialed into a phone number
SLOWWWWW
Old- 300 bits per second (bps) or baud rate
Now- 56k or kilobits per second

16. Comm. Hardware- Cable Modem
Coaxial (Coax) cable
High speed, always on
Broadband
20Mbps (Megabits per second)
Cable Modem

17. Comm. Hardware- DSL Modem
Digital Subscriber Line
High speed, always on
Broadband
Through phone lines
3Mbps
Can use phone & Internet at same time
Filters on phones

18. Comm. Hardware- Others ISDN (Old) T1 FiOS
Faster than dial-up, over phone line T1
High speed for business (1.5Mbps)
24 copper or Fiber optic telephone line
FiOS
Similar to T1
Faster speeds
Limited areas

19. Communication Hardware
Router
Connects computers
Shares one Internet connection
May allows wireless access
Firewall
Wireless Adapters or NIC

20. How They Connect

21. Review T or F. A modem converts analog to digital signals.
T or F. Hackers invade other people’s computers only for fun.
A _______ is confined to a limited geographical area.
A _______ is made up of several local area networks.
A _______ is a simple device that connects multiple computers together.

22. Who to Connect to? ISP Internet Service Provider
Pay them (Comcast, Verizon)

23. ISP Services Dial-Up Broadband Wi-Fi Slow Telephone Lines High Speed
Always On
Cable, DSL, Satellite
Cable, Phone, Dish/Air, Fiber Optics
Wi-Fi
Wireless access
Public (Starbucks)

24. Speeds

25. Network Security Issues
Control access to computer
User name, passwords
If none, unauthorized people can gain access & take/read valuable info OR change it so no one can use it
Passwords
Change often
Use upper & lowercase letters, numbers, punctuation
Not easy stuff
Don’t write them down “cheat sheet”
Broken mostly by shared ones or cheat sheets, not guessing

26. Network Security Issues
Firewall
Protects against unauthorized access to network from outside
Antivirus Software
Always be running, updating
Wi-Fi Protection
Use the security settings

27. Network Security Solutions
Be careful who you hire
People who don’t follow rules
Back up data off-site
Biometric security
Fingerprint reader
Voice pattern
Retina scan

28. Review
What device allows many PC’s to share a single, high-speed Internet connection?
Router
What are the companies called that charge you for Internet access?
ISP
What is the slowest Internet access method?
Dial-Up

29. Unit 9 Network Fundamentals
Living Online
Unit 9
Network Fundamentals