PK0-005 Practice Question: Basics of IT Infrastructure and IT Project Management
A project manager is leading a team that is implementing a new VoIP system across multiple offices. The project manager needs to ensure that the network infrastructure can support the real-time voice traffic. Which of the following are critical network considerations for VoIP deployment? (Choose two.)
⚠ Common exam trap
The trap here is selecting general network best practices like redundancy or encryption at rest, which are important overall but not the specific critical factors for real-time voice 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
✓
Low latency and jitter
QoS and low latency/jitter are fundamental for VoIP because voice traffic is real-time and sensitive to delays and packet loss. QoS prioritizes voice packets, while low latency and jitter ensure clear audio. Other options, such as redundancy, high bandwidth for file transfers, and encryption at rest, do not directly address the real-time transport requirements of VoIP and are therefore not critical network considerations for this deployment.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Low latency and jitter
Why this is correct
Low latency and jitter are essential for VoIP because voice communication is highly sensitive to delays and variation in packet arrival times. High latency causes echo and talk-over effects, while jitter leads to choppy audio. Ensuring minimal latency and jitter through network design, such as using dedicated VLANs and prioritizing voice traffic, is critical for a successful VoIP deployment.
- ✓
Quality of Service (QoS)
Why this is correct
QoS is critical for VoIP because it prioritizes voice packets over less time-sensitive data traffic, reducing latency, jitter, and packet loss. Without QoS, voice quality can degrade significantly during network congestion. Configuring QoS policies on routers and switches ensures that voice traffic receives the necessary bandwidth and low delay, which is essential for clear, real-time conversations.
- ✗
Data encryption at rest
Why it's wrong here
Data encryption at rest protects stored data, such as voicemail recordings, but does not affect the real-time transport of voice packets. While encryption of voice traffic in transit (e.g., SRTP) might be a security consideration, encryption at rest is not a critical network consideration for supporting real-time voice traffic. The primary network concerns are QoS, latency, and jitter.
- ✗
High bandwidth for file transfers
Why it's wrong here
High bandwidth for file transfers is not a critical consideration for VoIP; in fact, large file transfers can compete with voice traffic and degrade call quality if not properly managed. VoIP requires relatively low bandwidth per call, but it demands consistent, low-latency delivery. Prioritizing file transfers over voice would be counterproductive, so this is not a correct consideration.
- ✗
Network redundancy
Why it's wrong here
While network redundancy is important for overall availability, it is not a critical consideration specifically for supporting real-time voice traffic. VoIP can function without redundancy if the network is reliable. Redundancy adds cost and complexity and is typically considered for high-availability requirements, but it does not directly address voice quality issues like latency and jitter, which are the primary concerns for VoIP.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This PK0-005 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 PK0-005 exam.