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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+ tests the misconception that low latency is primarily about download speed or interference immunity, but the real trap is that VoIP requires symmetrical upload/download speeds to maintain consistent voice quality, which fiber provides inherently.
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 provides symmetrical upload and download speeds
Fiber-optic connections use separate strands for upstream and downstream data, enabling symmetrical speeds. For VoIP, this ensures consistent upload bandwidth for voice packets, which is critical for low latency and jitter. Cable broadband (DOCSIS) typically has asymmetric speeds due to shared upstream channels, making fiber the better choice for real-time voice traffic.
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
While fiber is fast, the key for VoIP is low latency and consistency, not just raw speed.
- ✗
Fiber is less prone to electromagnetic interference
Why it's wrong here
EMI is less of a factor for VoIP; latency is more critical.
- ✓
Fiber provides symmetrical upload and download speeds
Why this is correct
Symmetrical speeds and low latency ensure clear VoIP calls without jitter.
- ✗
Fiber is cheaper than cable
Why it's wrong here
Fiber is often more expensive than cable broadband.
Quick reference
Asymmetric Encryption Algorithm Comparison
| Algorithm | Key Exchange | Signatures | Equivalent Security Key | Notes |
|---|---|---|---|---|
| RSA-3072 | Yes | Yes | 128-bit | Widely deployed; slow for bulk data |
| ECDSA P-256 | No | Yes | 128-bit | Fast signatures; standard TLS certs |
| ECDH / ECDHE | Yes | No | 128-bit | Perfect forward secrecy in TLS 1.3 |
| DH / DHE | Yes | No | 128-bit (3072-bit key) | Replaced by ECDHE in modern TLS |
| Ed25519 | No | Yes | ~128-bit | SSH keys, modern PKI |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.