When testing internet speed, the results depend on the capabilities of both the router and the broadband connection. If a router is limited to 56 kbps, speed test websites will reflect this limitation rather than the higher potential speeds of the broadband line. Speed tests work by measuring the time it takes to send and receive data, which can be influenced by various factors such as server choice, time of day, network routing, and other users' activities on the same network. For accurate speed measurement, understanding the specifications of the modem and connection type (DSL or cable) is essential, but there are limited straightforward methods to assess speed beyond using these testing websites.