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Network Topologies

Network Topologies. The concept of a topology. The concept of a topology. The basic function of computers on the LAN is to provide the user with an almost limitless set of applications. Topologies. Physical. Logical. Physical Topologies define the actual layout of the wire (media).

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Network Topologies

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  1. Network Topologies

  2. The concept of a topology.

  3. The concept of a topology. The basic function of computers on the LAN is to provide the user with an almost limitless set of applications.

  4. Topologies Physical Logical • Physical Topologies define the actual layout of the wire (media). • For example, this classroom’s wiring is laid out in an extended star • Logical Topologies define how the media is accessed by the hosts. • For example, in this classroom hosts access the media on a first come, first served basis

  5. Physical Topologies Extended Star Bus Ring Hierarchical Star Mesh

  6. Bus Topology • Single backbone • All hosts directly connected to backbone • Each end of the bus must be properly terminated

  7. Ring Topology • No backbone • A host is directly connected to each of its neighbors • Used for token passing logical topologies

  8. Star Topology • All devices connected to a central point • Center of star is usually a hub or a switch • Used for Ethernet technologies

  9. Extended Star Topology • Connects individual star topologies together. • At the center of the star is a hub or a switch. • Extends the length and size of the network. • This is the topology we are using in our lab!

  10. Server Hierarchical Topology • Like the extended star except a computer controls traffic—not a hub or a switch.

  11. Mesh Topology • Each host has its own connection to every other host • Used in situations where communication must not be interrupted.

  12. Logical Topologies • Broadcast Topology • Each host on the LAN sends its data (or broadcasts its data) to every other host. • Access to media is based of “first-come, first-serve.” (Ethernet works this way) • Token Passing Topology • Access to media is controlled by an electronic token. • Possession of the token gives the host the right to pass data to its destination.

  13. Topologies

  14. What kind of topology is this?

  15. The Cloud What kind of topology is this?

  16. The Cloud What kind of topology is this?

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