Basic Concepts of a Computer Network

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Presentation transcript:

Basic Concepts of a Computer Network

Content The Need for a Computer Network LANs and WANs 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 : Disadv : 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 email winpopup (for Win 98) messaging file transfer

Resources sharing share peripheral device share internet connection 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...

Centralized Administration in terms of user management add user edit user delete user inactivate user in terms of security setting full control read only write execute

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)