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# Network topologies

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• http://whatis.techtarget.com/definition/network-topology
• http://whatis.techtarget.com/definition/network-topology
• ### Network topologies

1. 1. Topologies In communication networks, a topology is usually a schematic description of the arrangement of a network, including its nodes and connecting lines. There are two ways of defining network geometry: the physical topology and the logical (or signal) topology. There are six types of physical topologies which are mentioned below.
2. 2. Bus Topologies Every workstation is connected to a main cable named as the BUS.
3. 3. Constrains and benefits Benefits It is the cheapest type of topology Can easily connect to the computer via a linear bus Constrains If one single cable goes down the whole network goes down Terminators are required at both ends of the back bone cable.
4. 4. Ring topology Their workstations are connected in a closed loop configuration. Adjacent pairs of workstations are directly connected. Other pairs of workstations are indirectly connected, the data passing through one or more nodes.
5. 5. Constrains and benefits Benefits Constrains The data being transmitted between two nodes passes through all the intermediate nodes. No server is required. Failure of a network cable can sometimes make the network go down.
6. 6. Star topology In this topology there is a central server where all workstations are directly connected.
7. 7. Constrains and benefits Benefits Easy installation and configuration No disturbances occurred to the network when plugging or unplugging devices Easy to detect errors Cost effective Constrains Requires more cable length If the hub is damaged the whole system will get damaged.
8. 8. Mesh topology It has two schemes called mesh and partial mesh. In mesh each workstation is connected directly to each other. In the partial mesh topology, some workstations are connected to all the others, and some are connected only to those other nodes with which they exchange the most data.
9. 9. Constrains and benefits Benefits If any of the device is damaged the system remains safe. High security and easy to detect faults Constrains Installing and configuring is difficult Expensive kind of topology
10. 10. Tree topology It simply connects two or more star topologies together. The central computers of the star networks are connected to a main bus.
11. 11. Token topology It is used in a star or ring topology where the signal travels only in one direction.
12. 12. Logical topologies It refers to the path that the signal follows from node to node.
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