Exam 312-85 topic 1 question 9 discussion

Enrage Tech Company hired Enrique, a security analyst, for performing threat intelligence analysis. While performing data collection process, he used a counterintelligence mechanism where a recursive DNS server is employed to perform interserver DNS communication and when a request is generated from any name server to the recursive DNS server, the recursive DNS servers log the responses that are received. Then it replicates the logged data and stores the data in the central database. Using these logs, he analyzed the malicious attempts that took place over DNS infrastructure.
Which of the following cyber counterintelligence (CCI) gathering technique has Enrique used for data collection?