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 receiving traffic from a Service. The readiness probe is failing. What is the likely effect on the pod?
Why wrong: CrashLoopBackOff is related to containers repeatedly crashing, not readiness probe failures.
B
The pod will remain running but will not be included in the Service's endpoints
Readiness probes control whether a pod is included in the Service's load balancing pool. If it fails, the pod is removed from endpoints but continues running.
C
The pod will be terminated and restarted
Why wrong: A failing readiness probe does not terminate the pod; only a failing liveness probe would trigger a restart.
D
The pod will be evicted from the node
Why wrong: Eviction is not caused by readiness probe failure; it could be triggered by node pressure or other conditions.
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 remain running but will not be included in the Service's endpoints
A readiness probe determines if a pod is ready to receive traffic. If it fails, the pod is removed from the Service endpoints, but it continues running.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 marked as CrashLoopBackOff
Why it's wrong here
CrashLoopBackOff is related to containers repeatedly crashing, not readiness probe failures.
✓
The pod will remain running but will not be included in the Service's endpoints
Why this is correct
Readiness probes control whether a pod is included in the Service's load balancing pool. If it fails, the pod is removed from endpoints but continues running.
Related concept
Static NAT maps one inside address to one outside address.
✗
The pod will be terminated and restarted
Why it's wrong here
A failing readiness probe does not terminate the pod; only a failing liveness probe would trigger a restart.
✗
The pod will be evicted from the node
Why it's wrong here
Eviction is not caused by readiness probe failure; it could be triggered by node pressure or other conditions.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CKAD NAT questions on configuration and troubleshooting.
Application Observability and Maintenance — This question tests Application Observability and Maintenance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The pod will remain running but will not be included in the Service's endpoints — A readiness probe determines if a pod is ready to receive traffic. If it fails, the pod is removed from the Service endpoints, but it continues running.
What should I do if I get this CKAD question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CKAD NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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