Do consider how often the tools will be used and in what ways. They are expensive to buy and support. Make sure the use justifies the expense.
Do get full and accurate information on the application and protocol mix to be sure you create a representative test environment.
Don't assume you know what your performance requirements are for the new application, security device or network.
Do engage security, network and business managers to determine current and projected requirements so you understand what needs to be tested.
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