A Syslog collector is the correct solution as it is designed to aggregate and analyze logs from different network devices, providing a centralized point for monitoring. Syslog is a standard for message logging, thus widely supported across various devices, which makes it suitable for heterogeneous network environments. Implementing a Syslog collector helps in diagnosing problems, conducting audits, and ensuring compliance across network devices.

Using a traffic analyzer, while useful for examining content passing through the network, primarily focuses on the live analysis of traffic patterns rather than historical log aggregation. A configuration management database is critical for maintaining information about hardware and software assets and their configurations, not for log analysis. SNMP (Simple Network Management Protocol) collects and organizes information about managed devices on IP networks and modifies that information to change device behavior, which is different from log collection.