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The network media in use
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The performance of the sensor
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The overall network design
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The IPS design (Will the sensor analyze and protect many systems or just a few?)
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Virtualization (Will multiple virtual sensors be created in the sensor?)
Important issues to keep in mind in an IPS design include the following:
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Your network topology: Size and complexity, connections, and the amount and type of traffic.
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Sensor placement: It is recommended that these be placed at those entry and exit points that provide sufficient IPS coverage.
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Your management and monitoring options: The number of sensors often dictates the level of management you need.
Locations that generally need to be protected include the following:
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Internet: Sensor between your perimeter gateway and the Internet
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Extranet: Between your network and extranet connection
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Internal: Between internal data centers
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Remote access: Hardens perimeter control
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Server farm: Network IPS at the perimeter and host IPS on the servers
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