The use of alert thresholding in an IDS can reduce the volume of repeated alerts, but introduces which of the following vulnerabilities?

Thresholding only fires an alert after a minimum number of events occur within a time window. An attacker who paces malicious activity slowly enough will never reach that threshold, effectively evading IDS detection entirely. This is a well-known trade-off between reducing alert fatigue and enabling low-rate attack evasion.

Packet dropping based on volume is a behavior associated with rate-limiting or IPS inline blocking, not with IDS alert thresholding, which is purely a detection and alerting mechanism.

Fragmented packet reassembly is a separate IDS processing function that operates independently of alert thresholding logic.

Thresholding reduces how many alerts are generated based on event count or rate, but does not remove the ability to distinguish source IP addresses or differentiate traffic origins.