Networks - Topologies Flashcards
What does topology describe?
The shape of the network, as well as how it is connected and put together.
How does a bus topology work?
Devices are attached to a common backbone, typically based on copper wire.
Why are backbones limited in potential size?
Signals weaken with distance, leading to errors in transmission.
What are disadvantages of bus topology?
If backbone cable fails, entire network fails
As traffic increases, performance decreases
All computers can see the data transmission
Bus networks require terminators at the end of each bus. Why?
To prevent data being reflected back and increasing the risk of data collisions.
How does a star topology work?
Linking devices (hubs or switches) are used to connect devices to a server or multiple servers.
Why is star topology the most common?
It facilitates easy addition of nodes, and is also more robust than a single backbone architecture.
How does a ring topology work?
Each computer is connected to exactly two other computers.
What is ring topology an attempt to solve? How?
The problem of data collisions by sending all data frames in a single direction.
How does a mesh topology work?
Every node is connected directly to every other node.
Mesh topologies have multiple connections. What benefit does this have?
It is the most fault tolerant topology available.
What are the benefits of a bus topology?
Cheaper to set up
Doesn’t require additional hardware.
What are advantages of star topology?
- Consistent performance, regardless of network usage
- If one cable fails, only that station is affected
- Faster data transmission than a bus topology
- Easy to add new stations
- No data collisions
What are disadvantages of star topology?
- Expensive due to switch and cabling
* If central switch fails, rest of network fails.
What are advantages of mesh topology?
- As nodes increase, reliability and speed of network increases
- Faster since nodes don’t go through a central switch
- Potential to have no cabling cost with wireless devices.
