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Basic Concepts of a Computer Network

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

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Basic Concepts of a Computer Network

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  1. Basic Concepts of a Computer Network

  2. 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)

  3. Common Services in a network • File Server • Print Server • Application Server • ……

  4. 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)

  5. Uses of network • governmental departments • corporation / business sector • educational institutions • private apartments • home • hotel • entertainment

  6. 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

  7. 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

  8. The Need for a Computer Network • Advantage • Communication • Resources Sharing • Centralized Data Management • Software Sharing • Backup • Centralized Administration

  9. Communication • by using • email • winpopup (for Win 98) • messaging • file transfer

  10. Resources sharing • share peripheral device • printer • scanner • CD-ROM, other storage devices • Harddisk space • share internet connection • share CPU, RAM etc...

  11. Centralized Data Management • users can work separately in different place • but sharing the same database file • no need to update PC by PC

  12. 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

  13. Backup • network backup • more secure • more easy • minimize down time • lower the cost for the backup storage • room security • equipment requirement etc...

  14. 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

  15. 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)

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