Which medium is typically used for backbone cabling in an enterprise and long-haul networks?

• A. Copper cables
• B. Fiber optic
• C. Wireless
• D. Coaxial

Answer: (B)

Backbone cabling needs to carry a lot of data over long distances between buildings or across campuses. Fiber optic fits this role best because it transmits data as light, resulting in extremely low signal loss and the ability to support very high data rates over long spans. Single-mode fiber is ideal for long-haul and inter-building links, while multimode fiber works well for shorter campus runs and can be a cost option in those scenarios. Fiber’s immunity to electromagnetic interference and its non-conductive nature make it highly reliable in electrically noisy environments and safe for long runs. The capacity to use wavelength-division multiplexing further expands how much data can be sent over a single fiber, future-proofing the network as needs grow. Copper and coaxial cables have greater attenuation and EMI issues, and wireless, while useful in other contexts, doesn’t provide the stable, high-capacity backbone links typically required. In short, the combination of long-distance capability, high bandwidth, low loss, and interference resistance makes fiber optic the typical choice for enterprise and long-haul backbone cabling.