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Local Area Network Topology

Local Area Network Topology. LAN Architecture. - Protocol architecture - Topologies - Media access control - Logical Link Control. Topologies. is the arrangement of the various elements ( links ,  nodes Computers ) - Tree - Bus - Ring - Star. LAN Topologies.

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Local Area Network Topology

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  1. Local Area Network Topology

  2. LAN Architecture - Protocol architecture - Topologies - Media access control - Logical Link Control

  3. Topologies is the arrangement of the various elements (links, nodes Computers ) - Tree - Bus - Ring - Star

  4. LAN Topologies

  5. Bus and Tree each node is connected to a single cable The cable has start and end point- - Multipoint medium - Transmission propagates throughout medium - when send massege Need to identify target station Each station has unique address - Full duplex connection between station and tap Allows for transmission and reception - Need to regulate transmission To avoid collisions Data in small blocks - frames - Terminator absorbs frames at end of medium

  6. Frame Transmission - Bus LAN

  7. Disadvantages and Advantages of a Linear Bus Topology Advantages: - Easy to connect a computer or peripheral to a linear bus. - - Requires less cable length than a star topology. Disadvantages : - Entire network shuts down if there is a break in the main cable. - Terminators are required at both ends of the backbone cable. - Difficult to identify the problem if the entire network shuts down. - Not meant to be used as a stand-alone solution in a large building.

  8. Star Topology - Each station connected directly to central ode ((Usually via two point to point links Data on a star network passes through the hub, switch, or concentrator before continuing to its destination. The hub, switch, or concentrator manages and controls all functions of the network – - Only one station can transmit at a time - Central node can act as frame switch

  9. Advantages and Disadvantages Star Topology Advantages : - Easy to install and wire. - No disruptions to the network when removing devices. - Easy to detect faults and to remove parts. - Disadvantages : - Requires more cable length than a linear topology. - If the hub, switch, or concentrator fails, nodes attached are disabled. - More expensive than linear bus topologies because of the cost of the hubs, etc.

  10. Tree or Expanded Star - A tree topology combines characteristics of linear bus and star topologies. - It consists of groups of star-configured workstations connected to a linear bus backbone cable - Tree topologies allow for the expansion of an existing network

  11. Advantages and Disadvantages tree Topology Advantages : - Point-to-point wiring for individual segments. - Supported by several hardware and software venders. Disadvantages : - Overall length of each segment is limited by the type of cabling used. - If the backbone line breaks, the entire segment goes down. - More difficult to configure and wire than other topologies.

  12. Ring A network topology that is set up in a circular fashion in which data travels around the ring in one direction and each device on the right acts as a repeater to keep the signal strong as it travels

  13. Frame TransmissionRing LAN

  14. Considerations When Choosing a Topology Money. A linear bus network may be the least expensive way to install a network; you do not have to purchase concentrators. Length of cable needed. The linear bus network uses shorter lengths of cable. Future growth. With a star topology, expanding a network is easily done by adding another concentrator. Cable type. The most common cable in schools is unshielded twisted pair, which is most often used with star topologies

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