Mis slides presentation
- 2. What is Topology? • The topology of a space is the definition of a collection of sets (called the open sets) that include: – the space and the empty set – the union of any of the sets – the finite intersection of any of the sets • “Topological space is a set with the least structure necessary to define the concepts of nearness and continuity”
- 3. Types of Topologies • • • • • Bus Topology Star Topology Ring Topology Mash Topology Tree Topology
- 4. Bus Topology • A bus topology connects all stations in a linear fashion
- 5. Bus Topologies • Bus topology advantages: – It is inexpensive – It is easy to design and implement because the stations are simply daisy-chained together • Bus topology disadvantages: – It is difficult to troubleshoot – It requires termination
- 6. Star Topologies • The star network configuration is the most popular physical topology • In a star configuration, all computers or stations are wired directly to a central location: – Concentrator (a.k.a. hub) – Multistation Access Unit (MAU) • A data signal from any station goes directly to this central device, which transmits the signal according to the established network access method for the type of network
- 8. Star Topologies • Star topology advantages: – A break in one cable does not affect all other stations as it does in bus technologies – Problems are easier to locate because symptoms often point to one station – The second-easiest topology to design and install – Does not require manual termination • Instead the media is terminated in the station at the transceiver on the NIC and in the hub or MAU
- 9. Star Topologies • Star topology disadvantages: – Hubs, which are required for a star topology, are more expensive than bus connectors – A failure at the hub can affect the entire configuration and all connected stations – Uses more cable than bus topologies
- 10. Star Topologies • Bus and star topologies can be combined to form a star/bus or bus/star physical topology • Hubs that have connectors for coaxial cable as well as for twisted-pair wiring are used to form these types of networks • When different physical topologies are applied to a network, the result is often called a mixed media network
- 11. Ring Topology • Physical rings – Most often seen in Fiber Distributed Data Interface (FDDI) networks • FDDI is a WAN technology – Stations on a ring are wired to one another in a circle around the entire network
- 12. Ring Topology
- 13. Ring Topologies • Ring topology advantages: – It prevents network collisions because of the media access method or architecture required – Each station functions as a repeater, so the topology does not require additional network hardware, such as hubs
- 14. Ring Topologies • Ring topology disadvantages: – As in a bus network, a failure at one point can bring down the network – Because all stations are wired together, to add a station the network must be shut down temporarily – Maintenance on a ring is more difficult than on a star topology because an adjustment or reconfiguration affects the entire ring
- 15. Tree Topology • Characters of bus and star topology • Different groups • Backbone cable
- 16. Tree Topology
- 17. Tree Topology • Advantages – It provides point to point wiring for individual segments – It is supported by several hardware and software venders
- 18. Tree Topology • Disadvantages – Overall length of each segment is limited by the type of cabling used – If the backbone line breaks the entire segments goes down – It is more difficult to configure and wire than other topologies
- 19. Mesh Topology • • • • Physically connected Improved performance and reliability Don’t used in local area network Used in wide area network
- 20. Mesh Topology
- 21. Mesh Topology • Advantages – Dedicated link guarantee that each connection carry its own data load – Eliminates the traffic problems – If one link become unusable it does not harm the entire system – It is easy to troubleshoot
- 22. Mesh Topology • Disadvantages – Very expensive – Difficult to install and reconfigure
Editor's Notes
- #3: If you open a book on topology, you get very obtuse definitions involving open sets and such. Topology is really much simpler than that conceptually.