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I'm wondering what the benefits are of having multiple networks. It seem that it would be easier for administration for all the devices to be on one network. At what point does a company need two networks?
 

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In a large company people in each department may be storing and exchanging information with each other that should not be accessible by people in other departments. For example , a Human Resources department would have information on salaries and other compensation for every person in the company. A product development department may be working with all kinds of proprietary and trade secret information. Having separate sub-networks with their own servers would make it easier to keep the information isolated between departments.
 

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To expand on what Chuck has stated and what I stated in reply to your other thread, one reason for separate sub networks would be to provide the ability to control traffic in and out of particular sub networks. Another reason is to maintain network performance such as having VoIP traffic on a dedicated sub network which you can then apply network configuration optimizations to prioritize VoIP traffic or to keep network segments contained so there wouldn't be performance degradations from a large number of broadcasts (ie Windows and especially Apple with Apple Talk) that would not only impact the network devices but the clients connected to that sub network.

Sub networks can also aid over all O&M of a network allowing network admins to be able to apply changes to specific parts of the network without impacting the entire network. Troubleshooting can also be aided by allowing the network admins to focus only on a specific part of the network.
 
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