Star network

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Image showing star network layout

Star networks are one of the most common computer network topologies. In its simplest form, a star network consists of one central switch, or hub computer which acts as a router to transmit messages. If the central node is passive, the originating node must be able to tolerate the reception of an echo of its own transmission, delayed by the two-way transmission time (i.e. to and from the central node) plus any delay generated in the central node. An active star network has an active central node that usually has the means to prevent echo-related problems.

Comparing star networks to other types of network

Advantages

• Easy to implement and extend, even in large networks
• Well suited for temporary networks (quick setup)
• The failure of a non-central node will not have major effects on the functionality of the network.
• Reliable market proven system
• No problems with collisions of Data since each station has its own cable to the server/hub.
• Security can be implemented in the hub/switch.

Disadvantages

• Depending on the transmission media, length limitations may be imposed from the central location used
• Failure of the central node can disable the entire network
• Limited cable length and number of stations
• Maintenance costs may be higher in the long run

See also

• Bus network
• Ring network
• Mesh network
• Tree and hypertree networks

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