Which of the following is a filler panel used in empty rack spaces?

• A. Blanking panel.
• B. Patch panel.
• C. Cable manager.
• D. Cable comb.

Answer: (A)

The main idea here is controlling airflow and keeping the rack environment efficient. A blanking panel is a solid filler panel inserted into the unused spaces of a rack. By blocking those empty gaps, it prevents the hot exhaust air from the rear of equipment from circulating to the front of other devices, which helps avoid cooling inefficiencies and hot spots. It also helps keep dust out and makes cable routing cleaner behind the panel.

Patch panels, cable managers, and cable combs serve different purposes: a patch panel provides connectivity for cables, a cable manager organizes and routes cables, and a cable comb helps align and separate fiber cables. None of these fill empty rack spaces like a blanking panel does.