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Computer netwoks meaning, types, benefits

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Meaning, Types, and benefits of network

Meaning, Types, and benefits of network

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  • 1. Computer NetworksStructure and Types Connecting Devices BY Dr. SAJEEVE V.P. 2/2/2014 Dr.SAJEEVE VP 1
  • 2. Network- meaning Linking of two or more computers with or without wires so as to provide access- mutual or one way 2/2/2014 Dr.SAJEEVE VP 2
  • 3. Network – types- 1. 2. 3. 4. Based on structure-Star, Bus, Ring, Mesh Based on Area- WAN, LAN, MAN Based on status- Client-Server, Peer-Peer Based on Purpose- Storage Area Network, others 2/2/2014 Dr.SAJEEVE VP 3
  • 4. 1. Network – types- Based on Structures or Topology geometrical arrangement of devices, nodes and links, Nodes –end point-ws, terminal, equipment, etc Link-the comn.path- circuit, channel 1. Star Network 2. Bus Network 3. Ring Network 4. Mesh Network 2/2/2014 Dr.SAJEEVE VP 4
  • 5. 1. STAR NETWORK One computer at the centre Others around it. + Saves cable Fault in one node -other nodes unaffected No connection between nodes Node needs to connect through cental 2/2/2014 Dr.SAJEEVE VP 5
  • 6. STAR NETWORK- evaluation Merits Nodes easily added / removed Fault in one node, other nodes unaffected Easier to diagnose node failures. Demerits: If central hub fails, entire system collapses No connection between nodes Node needs to connect through cental 2/2/2014 Dr.SAJEEVE VP 6
  • 7. 2. Bus network Nodes connected in a serial To a single main (backbone) cable 2/2/2014 Dr.SAJEEVE VP 7
  • 8. Bus network- evaluation Merits Saves cable, less costly To a single main (backbone) cable Easy extension Demerits: Heavy traffic jam the network Every adnl. connection weakens the system Difficult to diagnose node failures 2/2/2014 Dr.SAJEEVE VP 8
  • 9. 3.Ring network Nodes connected in a circular cable 2/2/2014 Dr.SAJEEVE VP 9
  • 10. 3.Ring network- evaluation Merits Good for small net works Span longer distance Demrits Expensive Difficult to diagnse failure Revision interupts network. Expansion difficult 2/2/2014 Dr.SAJEEVE VP 10
  • 11. 4.Mesh network Main ring line connectes every node Besides nodes are connected mutually 2/2/2014 Dr.SAJEEVE VP 11
  • 12. 4.Mesh network Merits Good large organisations If main line fails, nodes continue to work Less traffic jam Demrits Most expensive Difficult to diagnse failure Revision interupts network 2/2/2014 Dr.SAJEEVE VP 12
  • 13. Network – what for? -USES 1.Sharing of resources  Processor speed  Storage  Hardwares -Peripherals connected-printer, scanner, camera, microphone, speakers, projector -Softare -Internet services 2. Savings in cost / resources/ installation 2/2/2014 Dr.SAJEEVE VP 13
  • 14. Network – what for 3. Quick, real-time two-way communication Information / data transfer Banking, fund transfer, email. 4. Easy and quick access to files 5. Personal touchvideo call and conference 6. Leads to efficiency-prompt employees to report to, work in time. 7. Distributed processing 8. Less supervision-system auto-checks 2/2/2014 Dr.SAJEEVE VP 14
  • 15. Network – risks 1. Failure of one unit in the network collapses the entire system 2. Too much sophistication makes difficult to manage and operate without experts 3. Data loss affects the entire system, especially if no proper backup. 4. Cost 5. Nodes not independent- permission 2/2/2014 Dr.SAJEEVE VP 15
  • 16. 2. Network – Types Based on area    LAN- Local Area Network MAN- Metropolitan (medium) Area Net Work WAN – Wide Area Network 2/2/2014 Dr.SAJEEVE VP 16
  • 17. LANLocal Area Network Network of computers in restricted (small) limited geographical area. Whole network confines to single site. Within an office, one organisation, campus. 2/2/2014 Dr.SAJEEVE VP 17
  • 18. LAN- Components      File servers Network operating system (software) PC, W. Stns, nodes-(computers) Network interface cards Cabling / wireless connectivity 2/2/2014 Dr.SAJEEVE VP 18
  • 19. 3. Network types- Based on statusNetwork Architectureorganisation of networks Client – server (main-sub) one main computer serving the nodes several nodes needing permission to access Peer-to peer (equal status) All computers are of same status having equal access to any other. no permission needed 2/2/2014 Dr.SAJEEVE VP 19
  • 20. LAN-WAN Comparison 1. 2. 3. 4. 5. WAN Wider area Aim- Communication External comunication link Hired services from third party- ISP Interruption frequent LAN 4. Small area Aim-resource sharing Only internal cables Owned 1. Little interruption 1. 2. 3. 2. Data error chance more 3. 7. More devices required 4. 7. 2/2/2014 link several LANs Dr.SAJEEVE VP May 6. Small chance Less devices May be linked to WAN 20
  • 21. What decides LAN-WAN ? 1. 2. 3. 4. 3 computers / 100 computers WAN needs to have many LANS One computer in India connected to another in the USA- WAN OR LAN? Two computers in the same lab connected through internet. 2/2/2014 Dr.SAJEEVE VP 21
  • 22. 4. Network – types- Based on Purpose A. Storage Area Network (SAN) centrally managed storage 1. Network Attached Storage (NAS) A dedicated shared storage File servers-large capacity to store Permit nodes to share 2. Direct Attached Storage (DAS) Storage attached to a single server. 2/2/2014 Dr.SAJEEVE VP 22
  • 23. 5. Other Network – types- Based on Purpose Based on mode of connection Wireless and wired Global and national Information super Highway global networking all digitally deliverable services. 2/2/2014 Dr.SAJEEVE VP 23
  • 24. Network devices 1. 2. 3. 4. 5. 6. Network Interface Card Front end processor specialise in extnl. com Multiplexer-routing multiple requests. MODEM- wifi Communication Channels-Cables/ Cell/tower/Satellite Remote access devices 1. 2. 3. 4. 5. Hub- connecting link for LANs Bridge, Repeater- strenthen- link if obstacles Router –processor-MAC addresses in NICs Switches-many ports- IP address 2/2/2014 Dr.SAJEEVE VP 24
  • 25. HUB 1. 2. 3. 4. 5. 6. 7. 8. A hardware device (include no s/w) Common linking point Usually connects two or more LANs Does not read addresses but Simply passes data without screening Flooding- sending all to all nodes other than sender- so more jam. Junction point for LANs Usually used in a campus to connect to LANs 2/2/2014 Dr.SAJEEVE VP 25
  • 26. Gateways 1. 2. 3. 4. 5. 6. 7. A hardware device (include no s/w) Entrance to a network Usually connects two or more LANs Does not read addresses but Simply passes data without screening Flooding- sending all to all nodes other than sender- so more jam. No data management capacity unlike routers or switches 2/2/2014 Dr.SAJEEVE VP 26
  • 27. Bridge 1. 2. 3. 4. 5. 6. 7. 8. Connects two n/w (LANs or WANs) Reads the destination address Sends the data only to the addressee So less jam Screens by destination address No floodingJunction point for LANs Usually used in different n/ws 2/2/2014 Dr.SAJEEVE VP 27
  • 28. Router 1. 2. 3. 4. 5. 6. 7. 8. 9. Connects two or more n/ws Of different protocols Programmable computer Reads the destination by MAC address Sends the data only to the addressee No flooding-less jam Reads data inside the packets So programmable Allow or not access certain data video/aud. 2/2/2014 Dr.SAJEEVE VP 28
  • 29. Switch 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Connects two or more n/ws Of different protocols Many ports Programmable computer Reads the destination by MAC address Sends the data only to the addressee No flooding-less jam Reads data inside the packets So programmable Allow or not- access certain data video/aud. 2/2/2014 Dr.SAJEEVE VP 29
  • 30. differences Respect HUB Gtwys Bridge RutrSwitch Read address different protocols Many ports Programmable compu Reads MAC address IP ADDRESS Addressee ONLY Fooding / jam Read inside packets Programmable Data screening. N N N N N N N Y N N N Y N N N N N Y N N N N Y Y YY NY YY YY NY YY NN YY YY YY 2/2/2014 Desti N N N N N N Y N N N Dr.SAJEEVE VP 30

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