1 / 29

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.

cahil
Télécharger la présentation

Living Online

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related