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Basic concept of computer network


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is a lesson about computer network that is the development EngAbdirahman Hassan Nour of students IT university Golis of Berbera to receive an assignment of the PPT 21Slide...

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Basic concept of computer network

  1. 1. Golis Of Berbera University Student Assignment Basic Concept of Computer Network IT Teacher: EngFahad Ahmed Hassan Prepared by: Abdirahman Hassan Nour McGraw-Hill Technology Education Copyright © 2006 Companies, Inc. All Berbera Prepared by: EngAbdirahman Hassan Nour by The McGraw-Hill Golis Universityrights reserved.
  2. 2. Definition of Computer network • A Computer network is a collection of computers and devices Connected together via communication devices and transmission media. For example it my connect computers, printers and scanners. 9A-2
  3. 3. Definition of Network Communication • Communication describes a process in which two or more computer, devices transfer data, instructions and information. 9A-3
  4. 4. Advantage of Computer networks • Sharing of Devices such as printer and scanner • Sharing program / software • Sharing files • Sharing data • Sharing information • Sharing of single high-speed internet connection • Better communication using internet services such as email, mailing list and internet Relate chat (IRC) 9A-4
  5. 5. Disadvantage of Computer Network • • • 9A-5 The larger network becomes, the more difficult it is to manage. If the network stops operating system, then it may not be possible to access various resources Computer Viruses: If any computer system in a network gets affected by computer virus, there is a possible threat of other systems getting affected too.
  6. 6. Sharing Data File server contains documents used by other computers. 9A-6
  7. 7. Types of Network 9A-7
  8. 8. Local Area Network (LAN) • A local area network is a network that connects computers and devices in a limited geographically area such as a home, school computer laboratory, office building. 9A-8
  9. 9. Metropolitan Area Network (MAN) • Metropolitan Area Network (MAN) is high speed network that connect local area network in Metropolitan Area such as city or town and handles bulk of communication activity across the region. • A MAN typically includes one or more LAN but covers a smaller geographically area than a WAN. 9A-9
  10. 10. Wide Area Network (WAN) • Wide Area Network is a network that covers a large geographically area such country or the world • WAN combines many types of media such as telephone lines, cables and radio wave. A WAN can be one large network or can consist of two or more LANs connected together. 9A-10
  11. 11. Difference Between the types of Computer network 9A-11
  12. 12. Network Architecture • Network Architecture is the over all design of a computer network that describes how a computer network is configured and what strategies are being used. • It also know as network model or network design. • Two main network architecture: 9A-12
  13. 13. Server and Clients • A network server is a computer designed to process requests and deliver data to other (client) computers over a local network or the Internet. • A Client is a computer that retrieves information from or uses resources provided by a server or main computer. 9A-13
  14. 14. Difference Between Server, Client and Peer to Peer 9A-14
  16. 16. Types of Network Communication 9A-16
  17. 17. Intranet • An intranet is a private network within an organization that resembles the internet. • organizations use intranets to provide information to their employees. • typical applications include electronic telephone directories, email addresses, employee information, internal job openings and much more. 9A-17
  18. 18. Extranet • Is a private network that connects more than one organizations • many organizations use the internet technologies to allow suppliers, customers and business partner limited access to their network • the purpose is to increase efficiency and reduce costs 9A-18
  19. 19. Internet • is a public network • it is worldwide collection of networks that links million of business, government agencies, educational institution and individuals. • internet users can access service like web browsing, email, file transfer, mailing list, chat rooms, instant messaging and newsgroups. 9A-19
  20. 20. Difference Between Internet, Intranet and Extranet Differences Extranet Internet Used for Private Private Public Types of users Provide information for organization employees Provide information to suppliers, customers and business partner Provide information for public Usages Telephone directories, internal job opening, employee information Access data, check status, place orders, send email Access all kinds of information Security 9A-20 Intranet High Use virtual private network (VPN) technology to communication over the internet more secure Loose
  21. 21. THANK`S ANY QUESTION McGraw-Hill by: EngAbdirahman Hassan © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. Copyright Nour Prepared Technology Education Golis University Berbera Prepared by: EngAbdirahman Hassan Nour Golis University Berbera