1. Physically inspect the cable for any visible signs of damage, such as cuts, kinks, or broken connectors. Damaged cables can lead to poor connectivity and slow internet speeds.

2. Use a cable tester( Wiremap Tester, etc) to check for continuity between the connectors on each end of the cable. This will ensure that all wires are properly connected and the cable is not broken or damaged.

3. Check for electromagnetic and radio frequency interference by using a cable tester( Fluke Tester, etc. ) with a noise immunity test. Interference can disrupt your network signal and cause connectivity issues.

4. Measure signal attenuation, or the loss of signal strength over the length of the cable, by using a cable tester ( A Fulke tester that has a built-in TDR functionality. ) with a time-domain reflectometer. This will help you determine the maximum distance the cable can transmit a signal without a significant loss in quality.

5. Perform a network speed test to determine the cable's capability to handle the speed requirements of your network. This will ensure that your network cable is capable of delivering reliable performance.

By following these steps, you can determine the quality of your network cable and ensure that it is capable of meeting the needs of your network.