CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. 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.
A pod has a readiness probe using tcpSocket on port 3306. The application listens on port 3306 but returns errors on database queries. What is the effect of the readiness probe?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The pod will be considered ready as long as the TCP port is open, even if the application is not fully functional
A readiness probe with tcpSocket only checks whether the TCP port is open and accepting connections. It does not verify application-level health, such as whether the application can process queries or return valid responses. Since port 3306 is open, the probe succeeds, and the pod is considered ready, even though the application returns errors on database queries.
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 pod will be evicted from the node
Why it's wrong here
Readiness probe failures do not cause eviction.
✓
The pod will be considered ready as long as the TCP port is open, even if the application is not fully functional
Why this is correct
tcpSocket probes only check if the port is accepting connections; they do not validate application-level health.
Related concept
Read the scenario before looking for a memorised answer.
✗
The pod will be marked not ready because the application returns errors
Why it's wrong here
tcpSocket does not check application response; errors are not detected.
✗
The container will be restarted due to readiness probe failure
Why it's wrong here
Readiness probe failures do not restart containers; they only remove the pod from Service endpoints.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume readiness probes check application health or error responses, but a tcpSocket probe only verifies that the port is open, not that the application is working correctly.
Detailed technical explanation
How to think about this question
A tcpSocket probe performs a three-way TCP handshake to the specified port; if the handshake completes, the probe is considered successful regardless of the application's internal state. This is defined in the Kubernetes API, where the probe's `tcpSocket` action does not read any response data. In real-world scenarios, using a tcpSocket probe for a database pod can mask application-level failures, such as a dead MySQL server that still holds the port open, leading to traffic being routed to a non-functional pod.
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 pod will be considered ready as long as the TCP port is open, even if the application is not fully functional — A readiness probe with tcpSocket only checks whether the TCP port is open and accepting connections. It does not verify application-level health, such as whether the application can process queries or return valid responses. Since port 3306 is open, the probe succeeds, and the pod is considered ready, even though the application returns errors on database queries.
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.
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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