tell me about connection speed(band width)and the limitation for star topology?

Answer 1

A star topology is designed with each node (file server, workstations, and peripherals) connected directly to a central network hub or concentrator.

Data on a star network passes through the hub or concentrator before continuing to its destination. The hub or concentrator manages and controls all functions of the network. It also acts as a repeater for the data flow. This configuration is common with twisted pair cable; however, it can also be used with coaxial cable or fiber optic cable.


Advantages of a Star Topology

Easy to install and wire.
No disruptions to the network then connecting or removing devices.
Easy to detect faults and to remove parts.

Disadvantages of a Star Topology

Requires more cable length than a linear topology.
If the hub or concentrator fails, nodes attached are disabled.
More expensive than linear bus topologies because of the cost of the concentrators.

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This is the most common topology in use in businesses today.
The speed of most STAR configurations is 100 megabits of data per second. With gigabit hub/switches and NIC cards speeds can be at 1000 megabits per second.

http://fcit.usf.edu/network/chap5/chap5.htm

Answer 2

In star topology there is a bottle neck. Its as simple as that.

All the computers connect to one source. That sources ability to answer requests has limits.