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Network topology and cable's


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presentation for Network topology and cable's
This PPT covers all the computer topology along with its applications and Ethernet cables make it possile for you to connect several components of a local area network together. They typically are available in two forms, crossover cables, and patch cables

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Network topology and cable's

  1. 1. Welcome to our presentation
  2. 2. Think unique Build unique
  3. 3. 3 Group member A.K.M. Asaduzzaman Kaushik Roy Md.Zahid Hasan MD.Asif Al Fahad
  4. 4. Topics  Network Topology  Cables 4
  5. 5. Network  LANs and WANs - Geographical coverage  LANs  A single geographical location, such as office building, school, etc  Typically High speed and cheaper.  WANs  Spans more than one geographical location often connecting separated LANs  Slower  Costly hardware, routers, dedicated leased lines and complicated implementation procedures. 5
  6. 6. Network Topologies
  7. 7. Ring Topology  Logical ring  Meaning that data travels in circular fashion from one computer to another on the network.  Typically FDDI, SONET or Token Ring technology are used to implement a ring network  Ring networks are most commonly wired in a star configuration  Token Ring has multi-station access unit (MSAU),equivalent to hub or switch. MSAU performs the token circulation internally. 7
  8. 8. Ring Topology 8 Advantages Disadvantages Cable faults are easily located, making troubleshooting easier Expansion to the network can cause network disruption Ring networks are moderately easy to install A single break in the cable can disrupt the entire network.
  9. 9. Star Topology  All computers/devices connect to a central device called hub or switch.  Each device requires a single cable  point-to-point connection between the device and hub.  Most widely implemented  Hub is the single point of failure 9
  10. 10. Star Topology 10 Advantages Disadvantages Easily expanded without disruption to the network Requires more cable Cable failure affects only a single user A central connecting device allows for a single point of failure Easy to troubleshoot and isolate problems More difficult to implement
  11. 11. Bus topology  Uses a trunk or backbone to which all of the computers on the network connect.  Systems connect to this backbone using T connectors or taps.  Coaxial cablings ( 10Base-2, 10Base5) were popular options years ago. 11
  12. 12. Bus Topology 12 Advantages Disadvantages Cheap and easy to implement Network disruption when computers are added or removed Require less cable A break in the cable will prevent all systems from accessing the network. Does not use any specialized network equipment. Difficult to troubleshoot.
  13. 13. Mesh Topology  Each computer connects to every other.  High level of redundancy.  Rarely used.  Wiring is very complicated  Cabling cost is high  Troubleshooting a failed cable is tricky  A variation hybrid mesh – create point to point connection between specific network devices, often seen in WAN implementation. 13
  14. 14. Mesh Topology 14 Advantages Disadvantages Provides redundant paths between devices Requires more cable than the other LAN topologies The network can be expanded without disruption to current uses Complicated implementation
  15. 15. Wireless media  Three types:  Radio wave  Infrared  Microwave  Speeds of wireless solutions don’t keep pace with cable solutions  Installation and maintenance are far more complicated and costly.  Some solutions require line-of-sight, such as infrared and microwave.
  16. 16. Zahid Hasan 142-15-3466
  17. 17. Twisted pair is made of insulated copper wires that have been twisted around each other to form wire pairs 17 Twisted-Pair Cables
  18. 18. Unshielded Twisted-Pair (UTP)  Typically wrapped inside a plastic cover (for mechanical protection)  A sample UTP cable with 5 unshielded twisted pairs of wires  The common use for this type of cable is telephone wiring and LAN communications. 18 MetalInsulator
  19. 19. Shielded Twisted-Pair (STP)  STP cables are similar to UTP cables, except there is a metal foil or braided-metal-mesh cover that encases each pair of insulated wires 19
  20. 20. Coaxial Cables  In general, coaxial cables, or coax, carry signals of higher freq (100KHz–500MHz) than UTP cables  Outer metallic wrapping serves both as a shield against noise and as the second conductor that completes the circuit 20
  21. 21. Fiber-Optic Cables 21
  22. 22.  An optical fiber consists of a core (denser material) and a cladding (less dense material)  Simplest one is a multimode step-index optical fiber  Light bounces back and forth along the core  Common light sources: LEDs and lasers 22
  23. 23. Cross Over and Straight Through  Cross-over: A cross-over cable is used to connect two computers via their NICs, without using a hub or switch.  Straight-through: A straight-through network cable is just what the name implies, a cable that passes data straight through from one end to another. Straight-through cables are used for a variety of connections. 23
  24. 24. Advantages and Disadvantages  Noise resistance ― external light is blocked by outer jacket  Less signal attenuation ― a signal can run for miles without regeneration (currently, the lowest measured loss is about ~4% or 0.16dB per km)  Higher bandwidth ― currently, limits on data rates come from the signal generation/reception technology, not the fiber itself  Cost ― Optical fibers are expensive  Installation/maintenance ― any crack in the core will degrade the signal, and all connections must be perfectly aligned 24