Which of the following is NOT a function of an Intrusion Detection System (IDS)?

An Intrusion Detection System (IDS) primarily focuses on identifying and responding to unauthorized access or breaches within a physical or digital environment. One key function of an IDS is alerting personnel when unauthorized access is detected, which supports the security of the premises. Monitoring door openings is also a function associated with an IDS, as keeping track of access points can help in identifying potential security threats.

Environmental monitoring is a crucial part of some IDS implementations, as detecting changes in the environment—such as temperature fluctuations or water leaks—can indicate security risks, especially in sensitive areas.

However, processing transactions does not fall under the typical functions of an IDS. Transaction processing is generally associated with business or financial systems rather than security systems focused on intrusion detection. Therefore, recognizing the distinct roles of various security measures helps clarify that transaction processing is outside the remit of what an IDS is designed to do.