In order to obtain and comply with certifications, independent external audits must be performed and satisfied.
Although some testing of certification controls can be part of an internal audit, they will not satisfy requirements.

Auditing, which can be supported to varying degrees by DLP solutions, is not a core component of them.
Data loss prevention (DLP) solutions have core components of discovery and classification, enforcement, and monitoring. Discovery and classification are concerned with determining which data should be applied to the DLP policies, and then determining its classification level.
Monitoring is concerned with the actual watching of data and how it's used through its various stages. Enforcement is the actual application of policies determined from the discovery stage and then triggered during the monitoring stage.

TLS uses the handshake protocol to establish and negotiate the TLS connection, and it uses the record protocol for the secure transmission of data.