Which of the following methods is NOT a way to collect data?

The method that is not a way to collect data is analysis by data mining. Data mining refers to the process of analyzing large sets of data to discover patterns, trends, and relationships within that data. It involves applying algorithms and techniques to extract meaningful insights from the data that has already been collected. However, data mining does not directly collect data; instead, it makes use of data that has been previously gathered.

In contrast, automatic collection, centralized collection by Network Management Systems (NMS), and port mirroring are all methods designed specifically for the collection of data. Automatic collection involves using software or tools that automatically gather data without manual intervention. Centralized collection by NMS refers to the aggregation of data from various network devices into a single management system for easier monitoring and management. Port mirroring is a method where the network traffic on one port is replicated to another port to monitor and analyze that traffic in real-time.

Therefore, the distinction lies in understanding that while analysis by data mining is focused on interpreting already collected data, the other options explicitly represent methods of gathering data from various sources.