1. Computing in the Modern World Unit 4
Networks

2. GPS: BCS-CMW-8. Students will demonstrate knowledge of basic components of computer networks.

3. Network
A collection of computers and devices connected together

4. Reasons Businesses Use a Network
Facilitate communications
Share hardware
Share data & information
Share software
Transfer funds

5. 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

6. Difference: the area of coverage
Types of networks
Local area network (LAN)
Wireless local area network (WLAN)
Metropolitan area network (MAN)
Wide area network (WAN)
Difference: the area of coverage

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

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

9. 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

10. 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?

11. Network Architectures
Design of computers, devices, and media in a network
Two Categories
Client/server
Peer-to-peer

12. 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

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

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

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

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

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. Intranet 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