During follow-up operations of the structured network troubleshooting process, which of the following documents need to be transferred? (Multiple Choice)

Which of the following authorization items is not required for risky operations?

Ethernet supports broadcast. Once a network loop occurs, this simple broadcast mechanism will cause catastrophic consequences. Which of the following symptoms may be caused by a loop? (Multiple Choice)

Which of the following operations should be performed preferentially for Telnet login failure troubleshooting?

Which of the following statements is not included in network security optimization?