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Networks (LAN: is a Local Area Network (Easy at sharing files - network…
Networks
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Network Topologies
Bus Topology
In a bus topology, all devices are arranged in a line, connected to a single backbone cable. Devices send data in both directions. This causes data collisions, which slow down the network
Ring Topology
In a ring topology, data moves in one directions around the ring, preventing collisions. But only one device can send data at a time and data passes through many devices before reaching its destination.
Star Topology
In a star topology all devices are connected to a central switch or server that controls the network.
Pros
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Better performance than other setups: data goes straight to the central device so all devices can transmit data at once (unlike ring network) and there are very few data collisions unlike bus network.
If a device fails or a cable is disconnected, the rest of the network is unaffected.
Cons
In a wired networks, device needs a cable to connect to the central switch or server. This can be expensive, e.g for an office building with 50 terminals.
If there is a problem with the switch or the server, then the whole network is affected.
Mesh Topology
The main advantage of a mesh topology is there is no single point where the network can fail. If the central switch or server of a star network fails then the whole network fails: in a mesh network, if one device fails then the data is sent along a different route to get to its target.
The traditional problem with mesh networks had been that they were very expensive: you needed a lot of wire to connect so many devices together. But now more people are using wireless technology, mesh networks are a more practical option.
A mesh topology is a relatively new network layout. It is decentralised: networking devices are either directly or indirectly connected to every other one without the need for one central switch or server. Mesh networks work by sending data along the fastest route from one device to another.
A full mesh topology is where every device is connected to every other device. In a partial mesh topology, not all devices are fully-connected.
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