Configuring rule sets is the first activity that should be completed during the implementation of a DLP solution, because rule sets define the criteria and actions for identifying, monitoring, and preventingdata loss incidents12. Rule sets are based on the organization's data classification, policies, and requirements, and they help to ensure that the DLP solution is aligned with the business objectives and risk appetite34. Configuring rule sets before enabling detection points, establishing exceptions workflow, or configuring reports helps to avoid false positives, false negatives, or unnecessary alerts5.
References
1: 3.13: Deploy a Data Loss Prevention Solution - Read the Docs
2: Plan and implement data loss prevention (DLP) [Guided] - NICCS
3: CONTINUOUS DIAGNOSTICS AND MITIGATION PROGRAM DATA PROTECTION ... - CISA
4: Continuous Diagnostics and Mitigation Program Technical ... - CISA
5: Data Loss Prevention Best Practices - ISACA Journal