- A
DHCP
Why wrong: DHCP assigns IP addresses but does not manage traffic prioritization.
- B
QoS
QoS prioritizes VoIP traffic to maintain call quality by reducing latency and jitter.
- C
DNS
Why wrong: DNS resolves domain names and does not affect traffic prioritization.
- D
VPN
Why wrong: VPN adds encryption overhead and can increase latency, not reduce it for VoIP.
Question 782 of 1,020
220-1201 Network Services Practice Question
This 220-1201 practice question tests your understanding of network services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often 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.
Detailed technical explanation
How to think about this question
QoS relies on classification and marking at Layer 2 (802.1p CoS) and Layer 3 (DSCP), with DiffServ architecture using Per-Hop Behaviors (PHBs) like EF for VoIP. In a real-world scenario, even with QoS configured, improper trust boundaries (e.g., not trusting DSCP markings from IP phones) can cause reclassification, negating prioritization and still leading to dropped calls during peak usage.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Network Services — This question tests Network Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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.
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