PK0-005 Practice Question: Basics of IT Infrastructure and IT Project Management
A company is deploying a new VoIP system. Which network infrastructure component is most critical for ensuring voice quality?
⚠ Common exam trap
Candidates often confuse bandwidth capacity (throughput, cable speed) with traffic prioritization, assuming that faster cables or higher firewall throughput alone guarantee voice quality, when in fact QoS is the only mechanism that prevents jitter and packet loss for real-time traffic.
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
✓
Switch QoS settings
Voice quality over VoIP is highly sensitive to latency, jitter, and packet loss. Switch QoS settings (e.g., 802.1p/DSCP marking, strict priority queuing) ensure that voice traffic is prioritized over data traffic, preventing delays and dropped packets that degrade call quality. Without proper QoS, even high-bandwidth links will suffer from poor Mean Opinion Scores (MOS).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cable category
Why it's wrong here
Cable category affects maximum speed but does not directly address voice quality.
- ✗
Switch port density
Why it's wrong here
Port density relates to the number of devices connected, not voice quality.
- ✗
Firewall throughput
Why it's wrong here
Firewall throughput impacts overall network speed but does not specifically prioritize voice traffic.
- ✓
Switch QoS settings
Why this is correct
QoS ensures voice packets are prioritized over other traffic, reducing latency and jitter.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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