1. Networks Intro to Digital Technology
Follow along and fill in your Guided Notes Handout.

2. What is a Computer Network?
A collection of computers and devices connected together

3. Why would a Business use a Network?
Facilitate communications
Share hardware
Share data & information
Share software
Transfer funds

4. Advantages of Networking
Facilitating Communications- , IM, chat rooms, blogs, etc.
Sharing hardware-save money
Sharing data & information-access to database for customers
Sharing software-save money
Transferring funds-payroll, make purchases on the Internet

5. Types of Networks – 4 Types
Local area network (LAN)
Wireless local area network (WLAN)
Metropolitan area network (MAN)
Wide area network (WAN)
Difference: the area of coverage

6. LAN
Limited geographical area
Home
School computer lab
Office
building

7. WLAN
LAN with no physical wires
Usually communicates with a wired LAN

8. MAN
High- speed network that connects LANs in a metropolitan area such as a city or town and handles the bulk of communications activity across that region.
Regulated by local or state government
Provided by telephone companies, cable television operators, and other organizations

9. WAN
Covers a large geographic area ( such as a city, country, or the world)
Combines many types of media such as telephone lines, cables, and radio waves
What is the world’s largest WAN?

10. Network Architectures
Design of computers, devices, and media in a network
Two Categories
Client/server
Peer-to-peer
Do you know any examples?

11. Client/Server Server-host computer Clients
Controls access to hardware, software, and other resources
Provides central storage area
Clients
Other computers and devices on the network that rely on the server for resources
EX. Server stores database of customers, Client access database

12. Client/Server
EX. Server stores database of customers, Client access database
10 or more computers

13. Peer-to-Peer Network Simple, inexpensive Less than 10 computers
Equal responsibilities and capabilities

14. Internet Peer-to-Peer (P2P
Users access each others hard disks and exchange files directly over the Internet
Examples:
Limewire
BitTorrent
Gnutella
Kazaa

15. Network Topologies
Layout of the computers and devices in a communications network.
Three most common:
Bus
Ring
Star
Mesh

16. Types of Topologies

17. Bus Network
Single central cable, to which all computers and other devices connect

18. Ring Network
A cable forms a closed loop (ring) with all computers and devices arranged along the ring

19. Star Network
All of the computers and devices ( nodes) on the network connect to a central device, thus forming a star

20. Mesh Network
Each component is connected to every other component.

21. Intranet What about an example here in the school?
Internal network that uses Internet technologies
Make company information accessible to employees
Examples:
telephone directories, event calendars, procedure manuals, employee benefits information, and job postings
What about an example here in the school?

22. Learn About Networks
PBS Interactive Lesson