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220-1201 Practice Question: Deploying VoIP phones and needs a connection with…
A company is deploying VoIP phones and needs a connection with low latency and consistent speeds. They are choosing between cable broadband and fiber-optic. Which factor makes fiber the better choice?
⚠ Common exam trap
CompTIA A+ may test the misconception that fiber's main advantage is simply higher download speed or lower cost. The key differentiator for VoIP is that fiber is immune to electromagnetic interference, which preserves signal integrity and consistent voice quality.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Fiber is less prone to electromagnetic interference
Fiber-optic cabling transmits data as pulses of light, making it immune to electromagnetic interference (EMI). This prevents noise and signal degradation that can affect copper-based cable broadband, ensuring consistent low-latency, low-jitter performance for real-time VoIP traffic. While fiber services are often symmetrical, symmetry is a provisioning choice rather than an inherent property of the medium, so EMI immunity is the factor that makes fiber the better choice.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Fiber has higher download speeds
Why it's wrong here
Higher download speed does not address the requirement for low latency and consistent throughput; fibre wins through lower signal attenuation and symmetric bandwidth, not peak rate. It tempts candidates because headline speed is the most advertised difference. Cable's shared coax segment causes latency variation under load.
- ✓
Fiber is less prone to electromagnetic interference
Why this is correct
EMI immunity is real but incidental; fibre's decisive advantage for VoIP is symmetric upstream and downstream bandwidth with low jitter under load. Coaxial cable shares the same upstream/downstream spectrum among subscribers, so contention raises latency regardless of interference.
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Fiber provides symmetrical upload and download speeds
Why it's wrong here
Fiber's symmetrical upload and download speeds directly satisfy the consistent-speed constraint, since cable broadband typically throttles upstream bandwidth via shared DOCSIS channels. VoIP requires bidirectional, low-latency packet flow, so matched upstream capacity prevents jitter and dropped calls that asymmetric cable connections introduce under load.
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Fiber is cheaper than cable
Why it's wrong here
Fiber is generally more expensive to install than cable, so cost is not the factor favouring it. Fiber wins on latency and consistent symmetrical speeds because light signals suffer less attenuation and are immune to electromagnetic interference. Cable would suffice where cost matters more than latency.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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