Cisco Certified Network Professional 2025 – 400 Free Practice Questions to Pass the Exam

NetFlow is a network protocol developed by Cisco for collecting IP traffic information and monitoring network performance. It allows for the gathering of statistics about traffic flows traversing an interface, which can be essential for network management, performance analysis, and security monitoring.

The option referencing "Legacy" is appropriate in this context as it highlights the fact that NetFlow is considered an established and traditional technology, often set apart from more current innovations. This classification underscores its long-standing usage in network traffic analysis and the foundational role it plays in many network management solutions.

The other options, while they relate to networking technologies, do not have a direct connection to the functionalities and capabilities provided by NetFlow. EtherChannel pertains to link aggregation for combining multiple physical Ethernet links into a single logical link, VLAN Trunking involves the transmission of multiple VLANs over a single physical connection, and Spanning Tree Protocol is focused on preventing loops in network topologies. None of these technologies are directly involved in the flow monitoring and traffic analysis that NetFlow is designed for.