RCDD Question #238: Real Exam Question with Answer & Explanation

The correct answer is B. Optical fiber cabling. Optical fiber is the optimal inter-building medium for a campus DAS due to its high bandwidth, long reach, and immunity to electromagnetic interference.

Question

You are designing a DAS that will support five buildings on a college campus. Which medium is best suited to ensure the best connectivity and throughput between the headend and backend devices located in the various buildings?

Options

ACoaxial
BOptical fiber cabling
CShielded twisted pair cabling
DUnshielded twisted pair cabling

Explanation

Optical fiber is the optimal inter-building medium for a campus DAS due to its high bandwidth, long reach, and immunity to electromagnetic interference.

Common mistakes.

A. Coaxial cable suffers significant signal attenuation over the longer inter-building distances of a campus environment and remains susceptible to ground loops between separate structures.
C. Shielded twisted-pair cabling has a maximum run length of approximately 100 m for standard Ethernet, making it impractical for inter-building campus links without adding repeaters.
D. Unshielded twisted-pair cabling shares the 100 m distance limitation of STP and is more susceptible to EMI, making it the least suitable option for a campus-scale DAS backbone.

Concept tested. DAS backbone medium selection for multi-building campus

Reference. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/campover.html

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