This CKAD practice question tests your understanding of services and networking. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO of the following are true about headless services? (Select 2)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DNS returns multiple A records, one for each pod's IP
Headless services set clusterIP: None, and they return DNS A records for each pod's IP. They are often used with StatefulSets. Option A and D are correct. Option B is false because they don't provide a single VIP. Option C is false because they are used with StatefulSets. Option E is false because they can be used with any selector, not just StatefulSets, but the most common use is with StatefulSets.
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.
✓
DNS returns multiple A records, one for each pod's IP
Why this is correct
For headless services, DNS returns the IPs of all pods matching the selector.
Related concept
Read the scenario before looking for a memorised answer.
✓
They set 'clusterIP: None' in the service spec
Why this is correct
Headless services explicitly set clusterIP to None.
Related concept
Read the scenario before looking for a memorised answer.
✗
They provide a stable virtual IP for load balancing
Why it's wrong here
Headless services do not provide a virtual IP; they return pod IPs directly.
✗
They cannot have a selector
Why it's wrong here
Headless services can have a selector; they work like regular services but without a cluster IP.
✗
They are used exclusively with Deployments
Why it's wrong here
Headless services are typically used with StatefulSets, not Deployments.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 CKAD 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
Identify which CKAD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Services and Networking — This question tests Services and Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: DNS returns multiple A records, one for each pod's IP — Headless services set clusterIP: None, and they return DNS A records for each pod's IP. They are often used with StatefulSets. Option A and D are correct. Option B is false because they don't provide a single VIP. Option C is false because they are used with StatefulSets. Option E is false because they can be used with any selector, not just StatefulSets, but the most common use is with StatefulSets.
What should I do if I get this CKAD question wrong?
Identify which CKAD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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