- A
NetworkPolicy with podSelector: {} and egress: [{to: [{ipBlock: {cidr: 0.0.0.0/0}}]}]
Why wrong: This allows all egress traffic to 0.0.0.0/0, which is permissive.
- B
NetworkPolicy with podSelector: matchLabels: app: compromised and policyTypes: ["Ingress"]
Why wrong: This only restricts ingress, not egress.
- C
NetworkPolicy with podSelector: matchLabels: app: compromised and egress: []
Correct: empty egress list denies all egress from the selected pod.
- D
NetworkPolicy with podSelector: matchLabels: app: compromised and egress: [{to: [{podSelector: {}}]}]
Why wrong: This allows egress to all pods, which is not isolation.
Question 965 of 997
NetworkPolicy — Deny All Egress Traffic from Pod
This CKS practice question tests your understanding of monitoring, logging and runtime 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. A key principle to apply: networkPolicy egress. 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 named 'compromised-pod' is suspected of making unauthorized outbound connections. You want to isolate the pod using a NetworkPolicy. Which policy correctly denies all egress traffic from the pod?
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
✓
NetworkPolicy with podSelector: matchLabels: app: compromised and egress: []
Option C is correct because a NetworkPolicy with podSelector matching 'compromised-pod' (via label app=compromised) and an empty egress list (egress: []) explicitly denies all egress traffic from the pod. This is the standard Kubernetes pattern to isolate a pod by default-deny egress. Option A allows egress to 0.0.0.0/0, which permits all outbound traffic. Option B only restricts ingress, not egress. Option D allows egress to pods matching an empty podSelector (all pods), thus permitting traffic to other pods in the namespace. Therefore, only option C achieves complete egress isolation.
Key principle: NetworkPolicy egress
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NetworkPolicy with podSelector: {} and egress: [{to: [{ipBlock: {cidr: 0.0.0.0/0}}]}]
Why it's wrong here
This allows all egress traffic to 0.0.0.0/0, which is permissive.
- ✗
NetworkPolicy with podSelector: matchLabels: app: compromised and policyTypes: ["Ingress"]
Why it's wrong here
This only restricts ingress, not egress.
- ✓
NetworkPolicy with podSelector: matchLabels: app: compromised and egress: []
Why this is correct
Correct: empty egress list denies all egress from the selected pod.
Related concept
NetworkPolicy egress
- ✗
NetworkPolicy with podSelector: matchLabels: app: compromised and egress: [{to: [{podSelector: {}}]}]
Why it's wrong here
This allows egress to all pods, which is not isolation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- NetworkPolicy egress
- PodSelector
- Default-deny egress
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
NetworkPolicy egress
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review networkPolicy egress, then practise related CKS questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this CKS question test?
Monitoring, Logging and Runtime Security — This question tests Monitoring, Logging and Runtime Security — NetworkPolicy egress.
What is the correct answer to this question?
The correct answer is: NetworkPolicy with podSelector: matchLabels: app: compromised and egress: [] — Option C is correct because a NetworkPolicy with podSelector matching 'compromised-pod' (via label app=compromised) and an empty egress list (egress: []) explicitly denies all egress traffic from the pod. This is the standard Kubernetes pattern to isolate a pod by default-deny egress. Option A allows egress to 0.0.0.0/0, which permits all outbound traffic. Option B only restricts ingress, not egress. Option D allows egress to pods matching an empty podSelector (all pods), thus permitting traffic to other pods in the namespace. Therefore, only option C achieves complete egress isolation.
What should I do if I get this CKS question wrong?
Review networkPolicy egress, then practise related CKS questions on the same topic to reinforce the concept.
What is the key concept behind this question?
NetworkPolicy egress
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Last reviewed: Jun 21, 2026
This CKS 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 CKS exam.
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