How to test Ethernet cables and WiFi speeds

I recently had to diagnose poor ethernet speeds in a home in Arlington, VA. A person was getting 60 Mbps/sec, certainly not bad, but far less than the paid for 100 Mbps/sec. The problem was first diagnosed by going to speed test websites: http://www.speedtest.net https://www.speakeasy.net/speedtest/ This computer had FIOS, so I plugged a testing computer
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