200-301 Question #1163: Real Exam Question with Answer & Explanation

Question

What are two facts that differentiate optical-fiber cabling from copper cabling? (Choose two.)

Options

• AIt is less expensive when purchasing patch cables.
• BIt carries electrical current further distances for PoE devices.
• CIt provides greater throughput options.
• DIt has a greater sensitivity to changes in temperature and moisture.
• EIt carries signals for longer distances.

Explanation

Optical fiber cabling distinguishes itself from copper by offering significantly higher throughput capabilities and supporting much longer signal transmission distances.

Common mistakes.

• A. Optical fiber patch cables are typically more expensive than copper patch cables due to the precision required in their manufacturing and connectors.
• B. Optical fiber transmits light, not electrical current, and therefore cannot carry electrical power for Power over Ethernet (PoE) devices; PoE requires copper cabling.
• D. Copper cabling can be more susceptible to electromagnetic interference (EMI) and RFI, and its performance can degrade significantly more with temperature changes affecting resistance, while fiber is immune to EMI.

Concept tested. Differences between fiber optic and copper cabling

Reference. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/LAN_Ext/DCI_L2_Ext/DCI_L2_Ext_Chap2.html

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