PK0-005 Practice Question: Basics of IT Infrastructure and IT Project Management
A project manager is leading a project to implement a new Voice over IP (VoIP) system across multiple offices. The project manager needs to ensure the network infrastructure can support the VoIP traffic. Which TWO factors should the project manager verify? (Choose two.)
⚠ Common exam trap
The trap here is selecting network management or security features like SNMP or port security, which are important but do not directly address the performance requirements of VoIP 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
✓
Bandwidth capacity
QoS configuration and bandwidth capacity are critical to support VoIP traffic. QoS ensures voice packets are prioritized to minimize latency and jitter, while sufficient bandwidth prevents congestion that could degrade call quality. DHCP scope, SNMP community strings, and port security are important for other aspects but do not directly ensure the network can handle 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.
- ✓
Bandwidth capacity
Why this is correct
Sufficient bandwidth is essential to handle the simultaneous voice streams. Each VoIP call consumes a certain amount of bandwidth (e.g., 64 Kbps or more with overhead). The project manager must verify that the network has enough capacity to support all concurrent calls without affecting other applications or causing call quality issues.
- ✓
Quality of Service (QoS) configuration
Why this is correct
QoS configuration prioritizes voice traffic over data traffic, reducing latency, jitter, and packet loss. For VoIP, ensuring QoS is critical to maintain call quality. The project manager must verify that network devices support and are configured for QoS to meet user expectations and avoid degradation during peak usage.
- ✗
Network switch port security
Why it's wrong here
Port security restricts which devices can connect to switch ports, enhancing security. However, it does not directly impact the network's capacity or ability to prioritize voice traffic. While important for overall security, it is not a primary factor in ensuring the infrastructure can support VoIP traffic from a performance standpoint.
- ✗
Dynamic Host Configuration Protocol (DHCP) scope
Why it's wrong here
While DHCP is used to assign IP addresses to VoIP phones, it is not a primary factor for supporting VoIP traffic quality. The scope must be adequately sized, but this is more about device provisioning than ensuring the network can handle the real-time traffic. The question asks about supporting VoIP traffic, which is about performance, not addressing.
- ✗
Simple Network Management Protocol (SNMP) community strings
Why it's wrong here
SNMP is used for network monitoring and management, not for directly supporting VoIP traffic. While monitoring is important, community strings are a security and management detail. They do not affect the network's ability to carry voice traffic with acceptable quality; thus, they are not a key factor to verify.
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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
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