mediumMultiple ChoiceObjective-mapped
220-1201 Practice Question: A customer complains that their VoIP phone…
A customer complains that their VoIP phone intermittently drops calls. A technician checks the network and finds high latency and jitter during peak hours. Which network service should be configured to prioritize VoIP traffic?
⚠ Common exam trap
Many exam-takers confuse network services like DHCP (address assignment) and DNS (name resolution) with traffic management. QoS is the correct service to prioritize VoIP traffic and reduce latency/jitter during congestion.
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
✓
QoS
B is correct because Quality of Service (QoS) is the network service designed to manage bandwidth and prioritize time-sensitive traffic like VoIP. By marking VoIP packets (e.g., with DSCP EF or CoS 5) and applying queuing mechanisms such as LLQ or CBWFQ, QoS reduces latency and jitter during congestion, directly addressing the intermittent call drops during peak hours.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DHCP
Why it's wrong here
DHCP assigns IP addresses but does not manage traffic prioritization.
- ✓
QoS
Why this is correct
QoS prioritizes VoIP traffic to maintain call quality by reducing latency and jitter.
- ✗
DNS
Why it's wrong here
DNS resolves domain names and does not affect traffic prioritization.
- ✗
VPN
Why it's wrong here
VPN adds encryption overhead and can increase latency, not reduce it for VoIP.
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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.