ISC2 Systems Security Certified Practitioner (SSCP) Practice Question
A security engineer must interconnect two office buildings located 5 km apart with a 10 Gbps link that will carry highly sensitive data. The route passes through an industrial area with significant electromagnetic interference (EMI). To minimize the risk of eavesdropping and ensure reliable performance over the required distance, which cabling option should the engineer recommend?
RG-6 coaxial cable with active repeaters every kilometer
Single-mode fiber-optic cable with 1310 nm optics
Cat 6A shielded twisted-pair cable
Multimode fiber-optic cable (OM3) with 850 nm optics
Single-mode fiber-optic cable is the best fit. It uses glass fiber strands to guide light, making it immune to EMI and very difficult to tap without detection, which protects sensitive data. Single-mode fiber also supports 10 Gbps (10GBASE-LR) at distances up to 10 km or more, comfortably covering the 5 km span between buildings. Multimode fiber cannot reliably support 10 Gbps over 5 km because most grades (OM3/OM4) are limited to a few hundred meters. Category 6A twisted-pair is limited to 100 m for 10 Gbps and offers minimal EMI resistance. RG-6 coaxial cable lacks the bandwidth and distance capabilities for 10 Gbps and is more susceptible to signal loss and interference than fiber. Therefore, single-mode fiber best meets the security, bandwidth, and distance requirements.
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ISC2 Systems Security Certified Practitioner (SSCP)
Network and Communication Security
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