A customer reports that they are missing vPC peer link redundancy between two Cisco Nexus 5548UP switches. The interfaces on both switches are configured and cable correctly. The interface status is up/down on switch 1 and up/up on switch 2. which two steps should be taken to isolate the root cause? (Choose two)

A customer reports that they are missing vPC peer link redundancy between two Cisco Nexus 5548UP switches. The interfaces on both switches are configured and cable correctly. The interface status is up/down on switch 1 and up/up on switch 2. which two steps should be taken to isolate the root cause? (Choose two)
A . Ask the customer if the link ever functional
B . Determine whether the fiber-optic cable type (single mode or multimode) matches the x2 modules
C . Swap the transceivers between the two interfaces
D . Determine whether the fiber-optic cable manufacturer is valid under the interoperability matrix
E . Swap the ends of the fiber-optic cable

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Answer: C, E