A company suffers an outage due to a bad module in a core switch. Which of the following is the proper order
of troubleshooting?

A.
Gather information, start at the top of the OSI model, and work down.

B.
Establish a plan of action to solve the problem.

C.
Establish a theory, identify the problem, duplicate the problem, test the theory, and repeat.

D.
Gather information, start at the bottom of the OSI model, and work up.