You want to test a WAN circuit in a way that more closely simulates a single SCP or FTP file transfer. Which method should you use?

Protocols like SCP and FTP typically use a single, long-lived TCP session for the data transfer portion of a file transfer. To simulate this accurately, a performance test must also use a single session. The VOS CLI tools network-diagnostics speed-test command includes a single-session option specifically for this purpose. This method provides a more realistic measurement of single-stream throughput, which can differ significantly from the multi-stream tests used to measure maximum link capacity.

A. The default internet speed test from Versa Director uses multiple parallel sessions to find the maximum aggregate throughput, not to simulate a single file transfer.

C. The show interfaces brief command provides cumulative packet and byte counters, not a real-time performance test that simulates a specific application's behavior.

D. The SD-WAN SLA monitor measures link quality (latency, jitter, loss) using small probe packets, not the bulk data throughput characteristic of a file transfer.

1. Versa Networks, "Versa Operating System (VOS) CLI Reference Guide," Release 21.2.2, Document ID: VOS-21.2.2-CLI-REF, Section: "tools network-diagnostics speed-test," pp. 1205-1207. (Documents the single-session parameter and its purpose for testing).

2. Versa Networks, "Versa Secure SD-WAN Configuration and Administration Guide," Release 21.2.2, Document ID: VOS-21.2.2-SD-WAN-C-A, Section: "Monitoring > Speed Test," p. 812. (Describes the speed test functionality and distinguishes between multi-session and single-session tests).