How can data transfer speed between servers and clients be tested?

To check the data transfer speed between servers and clients, you can use specialized tools and utilities, such as:

• iperf/iperf3 — allows measuring the network bandwidth between two nodes. A server and client are run, and the data transfer speed is measured.
• speedtest-cli — for checking internet connection speed.
• netcat (nc) — can be used for data transfer and measuring transfer time.

Example of using iperf3:

1. On the server, run:

iperf3 -s

2. On the client, run:

iperf3 -c <server_IP>

The transfer speed in Mbps will be displayed as a result.

You can also use built-in network traffic monitoring tools and application logs to assess data transfer performance.