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CCNA DNS Practice Question
Which option correctly matches an IP service symptom to the most likely service involved?
⚠ Common exam trap
The trap is to associate packet loss with a specific service; packet loss is a network condition, not a service. The correct answer focuses on the service (DNS) that directly causes the symptom of failed name resolution.
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
✓
DNS failures prevent name resolution
DNS failures prevent name resolution because DNS is the service that translates hostnames to IP addresses. Without DNS, users cannot reach resources by name, but IP connectivity remains unaffected. This matches the symptom described in option A, making DNS the correct service.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
DNS failures prevent name resolution
Why this is correct
Correct. DNS is the service that resolves hostnames to IP addresses. If DNS fails, name resolution fails, but other network functions may still work.
- ✗
Packet loss causes intermittent connectivity
Why it's wrong here
Packet loss is a symptom of general network issues, not a specific service. It can be caused by various factors such as faulty hardware, congestion, or errors.
When this WOULD be correct
In a question like 'Match each network issue symptom to the most likely cause,' where options include 'Intermittent connectivity' as a symptom and 'Packet loss' as a cause, this pairing would be correct.
- ✗
Bandwidth congestion slows transfers
Why it's wrong here
Bandwidth congestion is a network performance issue affecting transfers, not indicative of a specific service failure.
When this WOULD be correct
In a question asking to match network performance issues to their root causes, such as 'Match each network problem to its most likely cause,' bandwidth congestion would be correctly matched with 'oversubscribed link' or 'traffic shaping misconfiguration.'
- ✗
Jitter affects real-time services
Why it's wrong here
Jitter is a characteristic of real-time services like VoIP, but the question asks for the service involved. Jitter itself is not a service, but a symptom.
When this WOULD be correct
In a question asking to match symptoms to network issues (not services), such as 'Match each network problem to its likely cause,' jitter would be correctly matched to 'real-time services' as the affected application type.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓DNS failures prevent name resolutionCorrect answer▾
Why this is correct
Correct. DNS is the service that resolves hostnames to IP addresses. If DNS fails, name resolution fails, but other network functions may still work.
✗Packet loss causes intermittent connectivityWrong answer — click to see why▾
Why this is wrong here
Packet loss is a symptom of network issues like faulty hardware or congestion, not a service. The question asks to match a symptom to a service, and packet loss is not a service.
★ When this WOULD be the correct answer
In a question like 'Match each network issue symptom to the most likely cause,' where options include 'Intermittent connectivity' as a symptom and 'Packet loss' as a cause, this pairing would be correct.
Why candidates choose this
Candidates may confuse symptoms with services or causes, or think packet loss is a service because it's a common network problem term.
✗Bandwidth congestion slows transfersWrong answer — click to see why▾
Why this is wrong here
The question asks to match IP service symptoms to the most likely service involved. Bandwidth congestion is a symptom of insufficient network capacity, not a service itself; it is typically caused by high traffic load or link saturation, not a specific IP service.
★ When this WOULD be the correct answer
In a question asking to match network performance issues to their root causes, such as 'Match each network problem to its most likely cause,' bandwidth congestion would be correctly matched with 'oversubscribed link' or 'traffic shaping misconfiguration.'
Why candidates choose this
Candidates may confuse symptoms with services, thinking that bandwidth congestion is a service issue rather than a capacity problem, or they may misattribute it to a service like QoS when it is actually a resource constraint.
✗Jitter affects real-time servicesWrong answer — click to see why▾
Why this is wrong here
The question asks to match IP service symptoms to the most likely service involved. Jitter is a symptom of network latency variation, not a service itself; it is typically associated with real-time applications like VoIP, not a specific IP service.
★ When this WOULD be the correct answer
In a question asking to match symptoms to network issues (not services), such as 'Match each network problem to its likely cause,' jitter would be correctly matched to 'real-time services' as the affected application type.
Why candidates choose this
Candidates may confuse 'jitter' as a service symptom with the service itself, or think that 'real-time services' is a service name rather than a category of applications affected by jitter.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Visual reference
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Related to this question
Learn chapter
Diagnosing DNS Record Issues — A, AAAA, CNAME, MX, NS, and PTR Records
Key term
Fully Qualified Domain Name
A Fully Qualified Domain Name is the complete and unambiguous website or server name that includes the host, domain, and top-level domain, leaving no room for guesswork.
Key term
DNS
DNS is the system that translates human-friendly domain names like example.com into machine-readable IP addresses so computers can find each other on a network.
About these practice questions
Courseiva writes every 200-301 question from scratch — 1,389 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-301 practice question is part of Courseiva's free Cisco 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 200-301 exam.