Single-mode fiber is best suited for long-distance communication, often exceeding 10 km (6.2 miles). It's immune to EMI and offers high bandwidth - making it the ideal choice for connecting buildings across a city.
Coaxial (A) and Twinaxial (B) are used for shorter distances and specific use cases (e.g., storage or legacy systems).
Cat 5 (D) is limited to 100 meters and is not suitable for city-level interconnects.
# For long-distance, high-speed, and reliable communication between buildings, Single-mode fiber is the professional choice.
Reference:CompTIA Network+ N10-009 Official Study Guide - Objective 3.4: "Summarize the properties and purposes of physical network topologies and network types."