CompTIA Network+ (N10-009) N10-009 — Question 504

Two network switches at different locations are connected via fiber-optic cable at a distance of 10 miles (16km). The duplex fiber-optic patch cord between the patch panel and switch is accidentally pinched, stopping connectivity between the two switches. A network technician replaces the broken cable with a new. single-mode patch cord. However, connectivity between both switches is still down and the link lights are still off. Which of the following actions should the technician perform first?