3. 






5. Computer
Network)

6. File Server)
Communication
Chanel) Workstation or
Terminal) Network
Operation System)

7. Resources)

8. Receiver)
Transmitter)

9. Local Area Network
LAN)
Metropolitan Area
Network MAN)
Wide Area
Network WAN)

10. Local Area Network
LAN)

11. Metropolitan
Area Network MAN)
MAN

12. Wide Area Network
WAN)

13. Star Network)
Ring Network)
Bus Network)
Hybrid Network)

14. Star Network)
Work station

15. central node

16. Ring Network)
Media Access Units
(MAU)
PC)
Workstation
Server MAU
MAU 1

18. Bus Network)

20. Hybrid Network)