What does a network cable tester do?

The development of the Internet today is something we could never have imagined a few decades ago. The Internet has entered thousands of households and has become a part of our lives, but there are often some problems when using the Internet. In order not to find someone to repair it often, we need to understand and be familiar with the network. At the same time, we can also use network knowledge proficiently to solve some simple network problems for ourselves. So today, the editor will recommend an artifact to you, the network tester. The network tester can not only detect LAN failures, but also intelligently detect network layer health. The functions of the network tester mainly include physical layer, data link layer and network layer. Next, I will introduce the network tester to you in detail.