The Best Approach for Ensuring Data Loss Prevention (DLP) Control Effectiveness

A.

Of the given options, the BEST way to help ensure the effectiveness of a data loss prevention (DLP) control that has been implemented to prevent the loss of credit card data is option A, reviewing logs for unauthorized data transfers.

Reviewing logs for unauthorized data transfers is an essential step to monitor the effectiveness of the DLP control. Logs provide an auditable trail of all events and activities that take place on the network, including any attempts to transfer credit card data. By reviewing logs, an organization can identify any unauthorized data transfers and take corrective actions, such as investigating the incident, updating the DLP control, and providing additional training to users.

Option B, configuring the DLP control to block credit card numbers, is also a valid control measure. However, it alone does not ensure the effectiveness of the DLP control. Blocking credit card numbers only prevents unauthorized data transfers when the DLP control is properly configured, and users are educated about the control.

Option C, testing the transmission of credit card numbers, is not the best way to ensure the effectiveness of a DLP control. Testing the transmission of credit card numbers is a risky activity that can potentially compromise sensitive data, even if it is done in a controlled environment. Furthermore, it does not guarantee that the DLP control is effective in preventing unauthorized data transfers.

Option D, testing the DLP rule change control process, is also a valid control measure. However, it only ensures that changes to the DLP rules are implemented correctly. It does not provide any assurance that the DLP control is effective in preventing unauthorized data transfers.

In summary, reviewing logs for unauthorized data transfers is the BEST way to help ensure the effectiveness of a DLP control that has been implemented to prevent the loss of credit card data.