7. Components of communications hardware software -computers - hub -switch -router - NIC -wired -wireless -operating System - applications “ google, yahoo, msn”

10. Importance of Network & Communications E-business To conduct business transactions on The internet. Including online Shopping, selling and renting. Online Education Students at any location around the World can participate in an online Classroom, download tutorial Questions & submit their assignments. E-banking It handles all types of banking transactions such as account Management, fund transfer, Payments Bills, check account balance…. Long Distance Communication Cheaper, faster and more effective (video conference meeting)

15. Differences between types of network Criteria LAN MAN WAN Cost Low High Higher Network size Small Larger Largest Speed Fasters Slower Slowest Transmission media type Twisted pair Twisted pair & fiber optic cable Fiber optic, satellite, radio wave No. of computers. Smallest Large Largest

19. Differences between client-server and peer to peer Client –server Peer to peer Server control ability while client don’t All computers have equal ability High cost Cheaper cost Use small and large network Small networks Easy to manage Hard to manage

20. 3 types of network toplogies

24. Differences of network topologies Bus topology Ring topology Star topology Structure Single central cable (backbone) Connected in the loop (circle) Central host Host existence Depends on the network Depend on the network Yes Connection between nodes No connection Yes No connection Host failure Network still can run Network will fail Network will fail. Node failure Network still can run Network will fail Network will fail

27. Intranet Internet Internal network Global information Within an organization Various Organizations Internet Extranet Uses internet technology Uses intranet technology Serves everybody Serves enterprise (customer & suppliers) With/ without firewall With firewall Low security Tight security