Which of the following is true about the fault diagnosis of the server? (Multiple Choice)

Which of the following is true about the fault diagnosis of the server? (Multiple Choice)
A . Diagnose the inside first, and then diagnose the outside
B . Diagnose the network first, and then diagnose the network element
C . First high speed part, and then low speed part
D . Analyze high-level first, and then low-level alarms

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Answer: BCD