CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 Pod is running but not responding to requests. The liveness probe is a TCP check on port 8080. What is the most likely issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The application is listening on port 8080 but not processing requests correctly.
A is correct because a TCP liveness probe only checks if the port is open and accepting connections, not whether the application is actually processing requests. If the application is listening on port 8080 but is stuck or not handling HTTP traffic correctly, the TCP probe will still succeed, and Kubernetes will not restart the container. This is a common scenario where the application is 'alive' at the socket level but not 'healthy' at the application layer.
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.
✓
The application is listening on port 8080 but not processing requests correctly.
Why this is correct
A TCP probe only checks if the port is open, not if the application is healthy.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The container is being throttled due to CPU limits.
Why it's wrong here
CPU throttling would not prevent the TCP port from being open.
✗
The probe's initial delay is too short.
Why it's wrong here
That would cause restarts, not a non-responsive state.
✗
The liveness probe is misconfigured and should be an HTTP GET.
Why it's wrong here
A TCP probe is valid, but it may not detect application-level failures.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a successful TCP probe means the application is healthy, but Kubernetes only checks port availability, not application responsiveness, leading to a false sense of health.
Detailed technical explanation
How to think about this question
A TCP liveness probe uses a three-way handshake (SYN, SYN-ACK, ACK) to verify the port is open; it does not send any application-layer data. In contrast, an HTTP GET probe sends an actual HTTP request and expects a valid response (e.g., 200 OK), which can detect application-level failures like a stuck worker thread or a deadlocked database connection. In real-world scenarios, this distinction is critical for stateful applications like web servers or databases where the socket may remain open even if the application is in a degraded state.
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 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.
Application Observability and Maintenance — This question tests Application Observability and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The application is listening on port 8080 but not processing requests correctly. — A is correct because a TCP liveness probe only checks if the port is open and accepting connections, not whether the application is actually processing requests. If the application is listening on port 8080 but is stuck or not handling HTTP traffic correctly, the TCP probe will still succeed, and Kubernetes will not restart the container. This is a common scenario where the application is 'alive' at the socket level but not 'healthy' at the application layer.
What should I do if I get this CKAD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This CKAD practice question is part of Courseiva's free CNCF 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 CKAD exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.