This CKS practice question tests your understanding of supply chain security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An administrator applies the following Kyverno policy to the cluster. What is the effect of this policy?
apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
name: require-non-root
spec:
validationFailureAction: enforce
rules:
- name: check-runAsNonRoot
match:
resources:
kinds:
- Pod
validate:
message: "Running as root is not allowed."
pattern:
spec:
securityContext:
runAsNonRoot: true
It allows Pods that run as root if they have a reason
Why wrong: The policy does not allow exceptions; it enforces the rule strictly.
B
It applies only to Pods in the default namespace
Why wrong: ClusterPolicy applies to all namespaces unless specified otherwise.
C
It denies all Pods that do not specify a security context
The policy requires runAsNonRoot: true. If the security context is missing entirely, the field is not set, so the validation fails and the Pod is denied.
D
It only audits Pods and does not block them
Why wrong: The validationFailureAction is 'enforce', which blocks non-compliant resources.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It denies all Pods that do not specify a security context
The policy enforces that all Pods must have 'runAsNonRoot: true' in their security context. If a Pod does not have this setting, it will be rejected (enforce mode).
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.
✗
It allows Pods that run as root if they have a reason
Why it's wrong here
The policy does not allow exceptions; it enforces the rule strictly.
✗
It applies only to Pods in the default namespace
Why it's wrong here
ClusterPolicy applies to all namespaces unless specified otherwise.
✓
It denies all Pods that do not specify a security context
Why this is correct
The policy requires runAsNonRoot: true. If the security context is missing entirely, the field is not set, so the validation fails and the Pod is denied.
Related concept
Static NAT maps one inside address to one outside address.
✗
It only audits Pods and does not block them
Why it's wrong here
The validationFailureAction is 'enforce', which blocks non-compliant resources.
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 CKS 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 CKS NAT questions on configuration and troubleshooting.
Supply Chain Security — This question tests Supply Chain Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: It denies all Pods that do not specify a security context — The policy enforces that all Pods must have 'runAsNonRoot: true' in their security context. If a Pod does not have this setting, it will be rejected (enforce mode).
What should I do if I get this CKS 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 CKS 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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