How to decide which rules should be enabled.

[Bravo Snipper <snipperbravo () yahoo com>]

Hi

After snort installation now how can we decide that which rules should be enabled or we should enable all the rules 
given by snort. Can any one please share some  tutorial regarding this aspect of snort configuration.  

Plus can any one name some standard set of tools to  test snorts setup.

regards.

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