2. Assignment 2 1. Wong Mun Sim, Sylvia (s970588) Group member :

3. communications computer And networking

4. One computer can use the laser printer. The other computer can use the plotter. The hardware is not shared between users

5. Hardware sharing The three computers can use both the plotter and the laser printer. The advantage of sharing hardware via networks

6. The two people can ‘talk’ by typing messages to each other 2. communication

7. Data sharing in a networking 3. Data sharing

8. Local area network (LAN) Wide area network (WAN) Type of network 1. 2.

9. 1. Local area network (LAN) A LAN links independent computers and other peripheral devices over short distances. 2. Wide area network (WAN) A wide area network links computer systems over long distances.

10. Means of communication 1. Twisted-pair wire 2. Coaxial cable 3. Optical fibre 4. microwave 5. satellite

11. - It us typically used for telephone lines. - A modem is needed for signal - Telephone lines are designed for voice communication while computers use a digital signal. Twisted-wire pair

12. modem When two computers communicate to each other over a telephone lines, a modem is required for modulation and demodulation of signals.

13. Modulation : digital signals are converted to analogue signals Demodulation : analogue signals are converted to digital signals.

14. - commonly used for LAN applications - has greater capacity to transmit data. Coaxial cable

15. - Both voice and data signals can be carried on the same line. - data can travel very fast. Optical fibre

16. microwave - Data can be transmitted via microwave radio signals. - The radio signal travels in a direct line from one relay station to the next.

17. Microwave transmission is limited by line-of-signt

18. satellite Satellites are launched into space to relay data communication.

19. Three satellites can cover the Earth effectively

20. Communication software Communication software is needed to enable computers with different configurations to send messages to each other

21. Novell network A common communication software used in LAN is Novell.

22. Network topology It describes how computers are connected together to form a network.

23. Three major network topology 1. Star network 2. Ring network 3. Bus network

24. Star network

25. Ring network

26. Bus network