CKS Monitoring, Logging and Runtime Security Practice Question
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. 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.
During a security incident, you need to isolate a compromised pod named 'malicious-pod' in namespace 'default' to prevent it from communicating with other pods. Which command should you run?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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 networkpolicy.yaml
Pod isolation is achieved by applying a NetworkPolicy that denies ingress/egress traffic. 'kubectl apply -f networkpolicy.yaml' applies the policy. The policy must be written to deny all traffic.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 run networkpolicy --image=nginx --restart=Never
Why it's wrong here
This creates a pod, not a NetworkPolicy.
✗
kubectl delete pod malicious-pod
Why it's wrong here
Deleting the pod removes it but does not isolate it; it may be recreated by a controller. Isolation via NetworkPolicy is non-destructive.
✓
kubectl apply -f networkpolicy.yaml
Why this is correct
Correct. You must write a NetworkPolicy YAML that selects the malicious pod and denies all traffic, then apply it.
Clue confirmation
The clue word "which command" in the question point toward this answer.
This command does not exist; NetworkPolicy cannot be created directly with kubectl create with these flags.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
This command does not exist; NetworkPolicy cannot be created directly with kubectl create with these flags.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related CKS ACL questions on filtering logic and placement.
Monitoring, Logging and Runtime Security — This question tests Monitoring, Logging and Runtime Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: kubectl apply -f networkpolicy.yaml — Pod isolation is achieved by applying a NetworkPolicy that denies ingress/egress traffic. 'kubectl apply -f networkpolicy.yaml' applies the policy. The policy must be written to deny all traffic.
What should I do if I get this CKS question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related CKS ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Standard ACLs match source addresses.
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