With the increasing widespread use of network applications, detecting network failures has become crucial in resolving network issues. How can we use the simplest tools to detect network failures caused by cables and connecting devices? Here, we will introduce several practical methods for network failure detection.
### Using a Multimeter as a Detection Tool
A multimeter is a basic tool for checking whether the network transmission medium, twisted-pair cables, are properly conducting, and it is also the most commonly used and effective tool. By using the ohm setting on the multimeter, you can test if a single wire (both ends of one core wire) in the network is connected (a small ohm value close to 0 indicates that the two ends being measured are connected, while a large ohm value close to infinity indicates that they are not connected; both ends of the same wire should be connected). This allows you to determine which pin number at one end corresponds to which pin number at the other end of the wire. However, this method cannot measure the signal attenuation through the wire.