This KCNA practice question tests your understanding of kubernetes fundamentals. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 of the following kubectl commands would you use to apply a manifest file and also save it for later updates?
kubectl create -f manifest.yaml
Why wrong: Create is imperative and does not track updates as well as apply.
kubectl patch -f manifest.yaml
Why wrong: Patch is for partial updates, not for applying a full manifest.
kubectl replace -f manifest.yaml
Why wrong: Replace is imperative and requires the resource to exist.
kubectl apply -f manifest.yaml
Apply is the recommended declarative approach.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
kubectl apply -f manifest.yaml
The 'kubectl apply' command is used to apply a configuration to a resource by file or stdin. It also supports declarative management, tracking changes for updates.
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
For each option: why learners choose it and why it is or isn't the right answer here.
kubectl create -f manifest.yaml
Why it's wrong here
Create is imperative and does not track updates as well as apply.
kubectl patch -f manifest.yaml
Why it's wrong here
Patch is for partial updates, not for applying a full manifest.
kubectl replace -f manifest.yaml
Why it's wrong here
Replace is imperative and requires the resource to exist.
kubectl apply -f manifest.yaml
Why this is correct
Apply is the recommended declarative approach.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
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
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.
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
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.
What to study next
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 KCNA NAT questions on configuration and troubleshooting.
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FAQ
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Static NAT maps one inside address to one outside address..
The correct answer is: kubectl apply -f manifest.yaml — The 'kubectl apply' command is used to apply a configuration to a resource by file or stdin. It also supports declarative management, tracking changes for updates.
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 KCNA NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
This KCNA 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 KCNA exam.
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