Topologies

• Advantages of bus topology:

  1. Cheaper
  2. Easier to add new devices
• Disadvantages of bus topology:

  1. Slower
  2. Less secure
  3. bi-directional
• Advantages of star topology:

  1. Faster
  2. More secure
  3. More reliable
• Disadvantages of star topology:

  1. More expensive
  2. Central device can be a cause of failure
• Logical topology is how the devices communicate e.g. protocols
• Physical topology is the physical connection between devices e.g. cables
• Physical bus topology properties:

  1. All nodes connected to a single backbone cable
  2. Terminator at each end of the backbone cable
• Logical bus topology uses CSMA/CD (Carrier Sense Multiple Access with Collision Detection) protocol. This stops both transmissions of data and wait a random amount of time before retrying.