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Introduction to computer network

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Introduction to computer network

  1. 1. Introduction toComputer Networks
  2. 2. Computer Network Interconnection of two or more computers and peripherals Allows user to share and transfer information
  3. 3. Need of Computer Networks• Sharing Resources• Reduced Cost• Reduced time• Scalability• Reliability• Security
  4. 4. History of Computer Networks (ARPANET)• ARPA designed for Department of Defense (DOD), US• Small computers were connected to large mainframe computers• IMPs were connected to each other through modem• Supported different operating systems• Telenet and ftp services was provided by ARPANET
  5. 5. Types of Computer Networks Networks are classified depending on the geographical area covered by the network
  6. 6. Local Area Network Covers a small area Connects computers and workstations covering a local area like, office or home
  7. 7. Local Area Network• Advantages of LAN: • Improves productivity due to faster work • Provides easy maintenance • New systems can be installed and configured easily• Disadvantages of LAN: • Limited number of systems can only be connected • Cannot cover large area • Network performance degrades as number of users exceeds
  8. 8. Types of LAN LANs are classified depending on the techniques used for data sharing
  9. 9. Campus Area Network (CAN) Made up of multiple LANs within limited area Connects different LANs in a campus
  10. 10. Metropolitan Area Network• Interconnects networks within a city• Supports data and voice transmission
  11. 11. Wide Area Network• Covers a wide geographical area which includes multiple computers or LANs e.g. Internet

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