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Living Online

Living Online. Unit 9 Network Fundamentals. 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.

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Living Online

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  1. 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 Risks

  5. Why Hack? • Theft of services • Theft of Information • Hatred & vengeance • For the thrill of 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 email 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

  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 • 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 & email 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? • Email & 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) • 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 • Slow • Telephone Lines • Broadband • 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. Living Online Unit 9 Network Fundamentals

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