You are planning a 40Gbps link between two sites 35 km apart.

The correct answer is B. Single-mode fiber. A 35 km connection between two sites is a long-distance optical link, and single-mode fiber is the appropriate cable type for long-haul communication. HPE Aruba Networking transceiver documentation describes single-mode fiber as having a small core size and being suitable for long-haul communication because it transmits light in one mode and suffers less intermodal dispersion than multi-mode fiber. Multi-mode fiber is used for shorter-distance links inside buildings or data centers and is not the correct choice for a 35 km site-to-site connection. UTP copper cabling cannot support a 40Gbps Ethernet connection over 35 km. ZTP is Zero Touch Provisioning, not a cable type. HPE Aruba transceiver guidance also lists long-distance optical transceivers, such as 40 km single-mode fiber options, reinforcing that long-distance high-speed links require SMF rather than MMF or copper. Therefore, for a 40Gbps link between sites 35 km apart, the required cabling is single-mode fiber. ( arubanetworking.hpe.com )