Premises cables in LAN backbones often contain

Premises cables in LAN backbones often contain

• A. Only multimode fiber
• B. Only singlemode fiber
• C. Both multimode and single-mode fiber are available.
• D. Plastic optical fiber

Answer: (C)

Backbone cabling in LANs is designed to handle links over a range of distances, so different fiber types are used where they fit best. Multimode fiber is cost-effective for shorter runs inside a building or between nearby devices, since it works well with LEDs and delivers high bandwidth over relatively short distances. Single-mode fiber, on the other hand, carries signals over much longer distances with lower loss and is ideal for links between buildings or across larger campus footprints. Because a LAN backbone often includes segments that vary in length, it’s common to have both multimode and single-mode fiber available in premises cabling to match each link’s needs. Plastic optical fiber isn’t typical for backbone use due to higher losses and limited suitability for enterprise-speed networks.

Backbone cabling in LANs is designed to handle links over a range of distances, so different fiber types are used where they fit best. Multimode fiber is cost-effective for shorter runs inside a building or between nearby devices, since it works well with LEDs and delivers high bandwidth over relatively short distances. Single-mode fiber, on the other hand, carries signals over much longer distances with lower loss and is ideal for links between buildings or across larger campus footprints. Because a LAN backbone often includes segments that vary in length, it’s common to have both multimode and single-mode fiber available in premises cabling to match each link’s needs. Plastic optical fiber isn’t typical for backbone use due to higher losses and limited suitability for enterprise-speed networks.