To obtain more reliable results it is recommended to perform several ADSL connection speed tests, apart from the first one. This is useful to compare several ADSL connection results and ensure they're authentic, thus establishing an average between them. However, it is important to tell the technical differences between each of them and how these differences are determined in the results provided. In this way, existing speed connection tests are differentiated in the packets used in the test: some of them will use graphic files and other compression algorithms. The packet type will be essential in the result given by the connection speed test