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By Husnain Sherazi

By Husnain Sherazi. Computer Networks Topological Structures & Network Applications. NETWORK.

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By Husnain Sherazi

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  1. ByHusnain Sherazi Computer Networks Topological Structures & Network Applications

  2. NETWORK A network is defined as a system for connecting computers using a single transmission technology. The computers can communicate with each other in a network. They can send and receive data from each other when they are in a network.

  3. CLASSIFICATION OF NETWORKS Computer networks are classified by four factors which are as follow: 1) BY SIZE 2) BY CONNECTIVITY 3) BY MEDIUM 4) BY MOBILITY

  4. BY SIZE(1) 1. Local Area Network. (LAN) 2. Wide Area Network (WAN)

  5. BY CONNECTIVITY(2) • a) Point-to-Point • b) Broadcast • In Point-to-Point topology there are two topologies • 1) STAR topology • 2) TREE topology

  6. Star Topology

  7. Tree Topology

  8. BROADCAST • In broadcast topology there are further two categories • SATELLITE\RADIO • 2) RING TOPOLOGY

  9. Satellite/Radio

  10. Ring

  11. BY MEDIUM(3) The classification of networks is also based on the Medium of transmission. Following are the mediums of transmission: • Copper wire • Co-axial cable • Optical fiber • Radio waves

  12. BY MOBILITY(4) The networks are also classified according to their mobility. In this respect there are two types of networks. • Fixed networks • Mobile networks

  13. Uses of Computer Networks • Business Applications • Home Applications • Mobile Users • Social Issues

  14. Business Applications of Networks • A network with two clients and one server.

  15. Business Applications of Networks (2) • The client-server model involves requests and replies.

  16. Home Network Applications • Access to remote information • Person-to-person communication • Interactive entertainment • Electronic commerce

  17. Home Network Applications (2) • In peer-to-peer system there are no fixed clients and servers.

  18. Home Network Applications (3) • Some forms of e-commerce.

  19. Mobile Network Users • Combinations of wireless networks and mobile computing.

  20. Network Hardware • Body Area Networks • Home Networks • Local Area Networks • Metropolitan Area Networks • Wide Area Networks • Wireless Networks

  21. Broadcast Networks (2) • Classification of interconnected processors by scale.

  22. Body Area Networks • Monitoring a person in a pervasive electronic health care system, using • (a) a local hub • (b) a continuous wireless connection.

  23. Local Area Networks • Two broadcast networks • (a) Bus • (b) Ring

  24. Metropolitan Area Networks • A metropolitan area network based on cable TV.

  25. Wide Area Networks • Relation between hosts on LANs and the subnet.

  26. Wide Area Networks (2) • A stream of packets from sender to receiver.

  27. Wireless Networks • Categories of wireless networks: • System interconnection • Wireless LANs • Wireless WANs

  28. Wireless Networks (2) • (a) Bluetooth configuration • (b) Wireless LAN

  29. Wireless Networks (3) • (a) Individual mobile computers • (b) A flying LAN

  30. Home Network Categories • Computers (desktop PC, PDA, shared peripherals • Entertainment (TV, DVD, VCR, camera, stereo, MP3) • Telecomm (telephone, cell phone, intercom, fax) • Appliances (microwave, fridge, clock, furnace, airco) • Telemetry (utility meter, burglar alarm, babycam).

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