Just thought i'd throw in my experiences so far in NTA 4 and provide some heads up on functionality / how to use the product based on experience:
Here's a sample work flow for passive network analysis:
From experience rolling out NetFlow and other passive analysis solutions from a variety of vendors, the number 1 thing you can do to get value from your netflow system is to uniquely idenitfy applications and to do this on an ongoing basis.
Knowing that you have 160kbps of SMB data flowing between sites is "Technical" data. Knowing that this is "Group drive access" and therefore shouldn't be happening is "Business" information and far more relevant
Hope this helps!
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