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Computer Networks
1.Computer Networks ,[object Object],[object Object],[object Object],[object Object],[object Object]
Uses of Networks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Telecommunications System
2. The Telecommunications system ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],Communications processors
[object Object],[object Object]
Communication media and channels  ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],3. Network processing strategies
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],4. Types of computer networks ,[object Object],[object Object]
Bus Topology ,[object Object],[object Object],Server Computer 1 Computer 2 Computer 3 Laser Printer Scanner Computer n Common Bus ,[object Object],[object Object],[object Object]
Star Topology Hub Server Comp1 Comp2 Comp3 Comp4 Most common topology All nodes connected through hub Some hubs- intelligent hubs can monitor traffic and prevent collisions Broken connection affects node only Broken hub affects all
Ring Topology Server comp1 comp2 comp3 comp4 Nodes are connected in circular chain Each node examines data as it travels through ring A small packet called  token  is circulated in the ring If token is not addressed to the node examining it, it passes to the next node No danger of collisions as only one packet of data travels at a time in the ring
Mesh Topology Comp1 comp2 comp3 comp4 Least used topology Most expensive to implement A cable runs from every computer to other computers Advantage- data can never fail to be delivered as there are alternate paths
Hierarchical Topology Main Frame Mini1 Mini2 Mini3 comp1 comp2 compn
Hybrid Topology Server comp1 Printer Printer Main frame Mini Mini Star Ring Hierarchical
LAN technology ,[object Object],[object Object],[object Object],[object Object],[object Object]
Lan Technology- contd. ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],Wireless local area networks (WLANs)
[object Object],[object Object],Wide area networks (WAN)
[object Object],[object Object],Wide area networks (WAN) cont…
Enterprise Networking  ,[object Object]

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Computer Networks1

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  • 16. Star Topology Hub Server Comp1 Comp2 Comp3 Comp4 Most common topology All nodes connected through hub Some hubs- intelligent hubs can monitor traffic and prevent collisions Broken connection affects node only Broken hub affects all
  • 17. Ring Topology Server comp1 comp2 comp3 comp4 Nodes are connected in circular chain Each node examines data as it travels through ring A small packet called token is circulated in the ring If token is not addressed to the node examining it, it passes to the next node No danger of collisions as only one packet of data travels at a time in the ring
  • 18. Mesh Topology Comp1 comp2 comp3 comp4 Least used topology Most expensive to implement A cable runs from every computer to other computers Advantage- data can never fail to be delivered as there are alternate paths
  • 19. Hierarchical Topology Main Frame Mini1 Mini2 Mini3 comp1 comp2 compn
  • 20. Hybrid Topology Server comp1 Printer Printer Main frame Mini Mini Star Ring Hierarchical
  • 21.
  • 22.
  • 23.
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  • 26.