单选题Which of the following troubleshooting steps should be performed NEXT after a core router hasbeen reported down?（）AImplement a solution.BEstablish the outage cause.CIdentify all affected areas.DTest a solution.
单选题
Which of the following troubleshooting steps should be performed NEXT after a core router hasbeen reported down?（）
A
Implement a solution.
B
Establish the outage cause.
C
Identify all affected areas.
D
Test a solution.
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