This CKA practice question tests your understanding of troubleshooting. 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.
You have a Pod that is in CrashLoopBackOff. Which TWO of the following commands would be most helpful in diagnosing the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
kubectl logs <pod-name> --previous
Options A and B are correct. 'kubectl describe pod' shows events and container state, including termination reason. 'kubectl logs --previous' shows logs from the previous container instance. Option C shows current logs, which may be empty if the container crashes quickly. Option D shows resource usage, not crash reasons. Option E shows general events, but describe already includes them for the specific Pod.
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.
✗
kubectl get events --all-namespaces
Why it's wrong here
Shows events cluster-wide; describe pod already includes relevant events.
✓
kubectl logs <pod-name> --previous
Why this is correct
Shows logs from the crashed container instance, which often contains the error.
Related concept
Static NAT maps one inside address to one outside address.
✓
kubectl describe pod <pod-name>
Why this is correct
Provides events and container status including exit code and reason.
Related concept
Static NAT maps one inside address to one outside address.
✗
kubectl logs <pod-name>
Why it's wrong here
Current logs may be from the restarted container and may not show the crash.
✗
kubectl top pod <pod-name>
Why it's wrong here
Shows resource usage, not crash information.
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.
Trap categories for this question
Command / output trap
Shows events cluster-wide; describe pod already includes relevant events.
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 CKA 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 CKA NAT questions on configuration and troubleshooting.
Troubleshooting — This question tests Troubleshooting — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: kubectl logs <pod-name> --previous — Options A and B are correct. 'kubectl describe pod' shows events and container state, including termination reason. 'kubectl logs --previous' shows logs from the previous container instance. Option C shows current logs, which may be empty if the container crashes quickly. Option D shows resource usage, not crash reasons. Option E shows general events, but describe already includes them for the specific Pod.
What should I do if I get this CKA 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 CKA 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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