An application administrator reports application slowness when loading the application's web portal. The virtual machine is currently connected to a vSphere Distributed Switch. The application owner r

NetFlow is a built-in vDS feature that captures and exports IP traffic flow data - including source/destination IPs, ports, protocols, and byte counts - to an external NetFlow collector. This provides detailed, queryable traffic statistics for a specific virtual machine, making it the appropriate tool for diagnosing network-related application slowness.

Port Mirroring copies raw packets to a destination port for capture by a network analyzer, but it does not export flow-level statistics or traffic summaries to a reporting tool.

Network I/O Control is used to allocate and prioritize bandwidth across vDS uplinks for different traffic types, not to capture or report on traffic flows for a specific virtual machine.

Promiscuous Mode is a NIC setting that allows a virtual machine to receive all traffic on its port group, which is a security-relevant access mode and not a mechanism for gathering or exporting traffic information.