The device installation procedure is as follows: Prepare tools -> Install mounting ears -> Install floating nuts and guide rails based on site requirements -> Install the device in the cabinet.

In the structured network troubleshooting process, troubleshooting results are predictable and the troubleshooting impact is controllable, without generating new risks.

Which of the following steps or measures are taken in the one-by-one check phase of the structured network troubleshooting process? (Multiple Choice)

As shown in the figure, it is assumed that STP is not enabled and a loop has occurred. The possible phenomena include which of the following options?

Which of the following is the core idea of network troubleshooting?