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Transcript of Networks
http://www.apple.com/uk http? WWW is a information sharing model that is built ontop of the internet, WWW uses http to access webpages. Network Topology Network topology describes a networks layout and the way in which the computer and hardware, known as nodes, are all linked together. Bus Topology In Bus topology all nodes of the network are connected to the central line and all data transmitted goes through the central cable Ring Topology In Ring topology all nodes are connected together in a loop, data is transmitted from node to node in a single direction Star Topology In Star Topology all nodes are directly connected to the central computer or mainframe More secure connection as data is sent directly between nodes
A failure of the cable will only affect one node, hence faults are easier to pinpoint.
Easy to add new nodes without any disruption Requires and is dependent upon a central computer.
Requires more cable and is therefore more expensive to setup. Advantages Disadvantages Data transmission is fast and simple because data can only travel in one direction
There is no dependence or need of a central computer or mainframe. If one node fails then data cannot continue to be transferred and therefore all other nodes fail
Harder to add new nodes into the system, requires the network to be disrupted. Advantages Disadvantages Easy to add and remove nodes
Requires small amount of cable; quite cheap and easy to setup and troubleshoot. A failure in the central line means the whole network will go down.
Data can on travel in one route therefore performance will lack because more data is transmitted Advantages Disadvantages