Presentation on theme: "Basic Concepts of a Computer Network. Content The Need for a Computer Network LANs and WANs –LANs Peer-to-Peer Server-Client Connecting to a computer."— Presentation transcript:
Basic Concepts of a Computer Network
Content The Need for a Computer Network LANs and WANs –LANs Peer-to-Peer Server-Client Connecting to a computer Network –network interface card (NIC) –Connecting Device … switch, hub, router –Network cables … coaxial cable, UTP, optical fibre –Wireless network –Network Topology … bus, star, ring –Network Operating System (NOS)
Common Services in a network –File Server –Print Server –Application Server –……
What is a computer network A computer network is a system –of interconnected computers –that can exchange information and –share resources resources –files / data / information / document –software –Hardware (device : harddisk drive, floppy disk drive, CD- ROM drive, printer, scanner)
Uses of network –governmental departments –corporation / business sector –educational institutions –private apartments home hotel –entertainment
Standalone computer –Powerful, valuable tools for individual use –But during …. File transfer by file copying, then give the disk to the other Adv : –Allow us to socialize with a friend while we exchange and merge data –low cost, more secure, low technique required Disadv : –far too slow –inefficient to meet the the need and expectation today –depends on distances we want the data to travel
When networked –values increase greatly –Adv : Reduce the need of paper communication increase efficiency nearly all type of data can be available simultaneously to every user –Disadv : Less secure much more technique required
The Need for a Computer Network Advantage –Communication –Resources Sharing –Centralized Data Management –Software Sharing –Backup –Centralized Administration
Communication –by using winpopup (for Win 98) messaging file transfer
Resources sharing –share peripheral device printer scanner CD-ROM, other storage devices Harddisk space –share internet connection –share CPU, RAM etc...
Centralized Data Management –users can work separately in different place –but sharing the same database file –no need to update PC by PC
Software sharing –some software has standalone version and also network version –using network version lower the purchase cost minimize the installation procedure minimize problem caused by configuration changes
Backup –network backup more secure more easy minimize down time lower the cost for the backup storage –room security –equipment requirement etc...
Networking Classification By geographical limit / size –LANs / WANs By computer relationship –server-client / peer-to-peer By wiring layout / method –topology (bus / star / ring / mesh)