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Constant sources of network traffic in a Trend Micro Apex Central network are "product logs", logs that managed products regularly send to the Trend Micro Apex Central server.

Trend Micro Apex Central Log Traffic

Log
Contains Information About
Virus/Spyware/Grayware
Detected virus/malware, spyware/grayware, and other security threats
Security
Violations reported by content security products
Web Security
Violations reported by web security products
Event
Miscellaneous events (for example, component updates, and generic security violations)
Status
The environment of a managed product. The Status tab of the Product Directory displays this information
Network Virus
Viruses detected in network packets
Performance Metric
Used for previous product versions
URL Usage
Violations reported by web security products
Security Violation
Violations reported by Network VirusWall products.
Security Compliance
Endpoint compliances reported by Network VirusWall products
Security Statistic
The difference between security compliances and security violations calculated and reported by Network VirusWall products.
Endpoint
Violations reported by Web security products.
Data Loss Prevention Log
Detections related to Data Loss Prevention policy violations
Behavior Monitoring Log
Behavior-based malicious activity detections
Network Inspection Log
Includes IP address or domain detections
Predictive Machine Learning Log
Predictive Machine Learning detections
Virtual Analyzer Log
Detections reported by Virtual Analyzer for suspicious sample submissions
File Hash Detection Log
Detections triggered by File or File SHA-1 suspicious objects