A customer reports that it cannot establish a vPC peer link between two Cisco Nexus 5548UP Switches. The interfaces on both switches are configured and cabled correctly. The interface status is up/down on switch 1 and up/up on switch 2. Which three steps are taken to isolate the root cause? (Choose three.)
A. ask the customer if the link was ever functional
B. determine whether the fiber-optic cable type (single mode or multimode) matches the X2 modules
C. swap the fiber-optic cable with one known to be good
D. swap the transceivers between the two interfaces
E. swap the ends of the fiber-optic cable
