In a building network, what is the term for the high-capacity fiber connection interlinking multiple switches?

• A. Access link
• B. Backbone
• C. Drop line
• D. Uplink

Answer: (B)

The main idea here is the backbone—the high-capacity fiber path that forms the central spine linking multiple switches across the building. This backbone carries aggregated traffic from the access-layer switches on different floors or areas and connects to core or distribution devices, providing the high bandwidth and redundancy needed to move data efficiently through the network. The fiber backbone is what ties the whole internal network together, enabling communication between floors, departments, and external networks.

Think of access links as the connections from switches to end-user devices, and a used-up uplink as simply the port that ties an access switch up to the higher layer. A drop line typically refers to bringing service into a location and isn’t about interconnecting the building’s switches. So the term that best describes the high-capacity fiber interlinking multiple switches is backbone.