- A
Apply a NetworkPolicy with ingress rule allowing from a specific pod only
Why wrong: This alone does not deny other traffic; you need a default deny policy.
- B
Apply a NetworkPolicy with empty podSelector and ingress rule allowing all
Why wrong: This would allow all ingress to all pods.
- C
Apply a NetworkPolicy with podSelector: matchLabels: { app: myapp } and ingress rule with namespaceSelector: { matchLabels: { name: monitoring } }
Why wrong: This selects pods in monitoring namespace, not the monitoring pods themselves.
- D
Apply a NetworkPolicy with podSelector: matchLabels: { app: myapp }, ingress: [ { from: [ { podSelector: { matchLabels: { role: monitoring } } } ] } ]
This allows ingress from monitoring pods.
- E
Apply a NetworkPolicy with podSelector: matchLabels: { app: myapp }, policyTypes: [Ingress], and no ingress rules
This denies all ingress by default.
CKA Services and Networking Practice Question
This CKA practice question tests your understanding of services and networking. 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.
Which TWO of the following are valid ways to isolate a set of pods from all ingress traffic except from monitoring pods?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Apply a NetworkPolicy with podSelector: matchLabels: { app: myapp }, ingress: [ { from: [ { podSelector: { matchLabels: { role: monitoring } } } ] } ]
To isolate pods from all ingress except monitoring, you can define a NetworkPolicy that denies all ingress (default) and then allows ingress from monitoring pods. Option A has no rules, which denies all. Option B allows from monitoring pods. Option C uses namespaceSelector incorrectly. Option D allows all. Option E allows from specific pods, but only one rule. The correct combination is A to deny all and B to allow monitoring.
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.
- ✗
Apply a NetworkPolicy with ingress rule allowing from a specific pod only
Why it's wrong here
This alone does not deny other traffic; you need a default deny policy.
- ✗
Apply a NetworkPolicy with empty podSelector and ingress rule allowing all
Why it's wrong here
This would allow all ingress to all pods.
- ✗
Apply a NetworkPolicy with podSelector: matchLabels: { app: myapp } and ingress rule with namespaceSelector: { matchLabels: { name: monitoring } }
Why it's wrong here
This selects pods in monitoring namespace, not the monitoring pods themselves.
- ✓
Apply a NetworkPolicy with podSelector: matchLabels: { app: myapp }, ingress: [ { from: [ { podSelector: { matchLabels: { role: monitoring } } } ] } ]
Why this is correct
This allows ingress from monitoring pods.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
Apply a NetworkPolicy with podSelector: matchLabels: { app: myapp }, policyTypes: [Ingress], and no ingress rules
Why this is correct
This denies all ingress by default.
Related concept
Static NAT maps one inside address to one outside address.
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.
What to study next
Got this wrong? Here's your next step.
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.
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Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this CKA question test?
Services and Networking — This question tests Services and Networking — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Apply a NetworkPolicy with podSelector: matchLabels: { app: myapp }, ingress: [ { from: [ { podSelector: { matchLabels: { role: monitoring } } } ] } ] — To isolate pods from all ingress except monitoring, you can define a NetworkPolicy that denies all ingress (default) and then allows ingress from monitoring pods. Option A has no rules, which denies all. Option B allows from monitoring pods. Option C uses namespaceSelector incorrectly. Option D allows all. Option E allows from specific pods, but only one rule. The correct combination is A to deny all and B to allow monitoring.
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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Last reviewed: Jun 21, 2026
This CKA 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 CKA exam.
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