CKS Monitoring, Logging and Runtime Security Practice Question
This CKS practice question tests your understanding of monitoring, logging and runtime security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A security team suspects a compromised pod is making unexpected outbound connections to an external IP. Which of the following is the BEST first step to investigate the network traffic from that pod?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Run 'kubectl exec <pod> -- tcpdump -i eth0' to capture packets
Using 'kubectl exec' with tools like tcpdump or netstat allows you to inspect network connections from within the pod. Option B is plausible but not as direct. Option C (Falco) is for runtime security but not specifically for network traffic analysis. Option D is about blocking, not investigation.
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.
✗
Deploy Falco with a rule to detect outbound connections
Why it's wrong here
Falco can detect connections, but this is more of a monitoring solution, not an immediate investigation step.
✗
Create a NetworkPolicy to deny all egress traffic
Why it's wrong here
This is a remediation step, not investigation.
✓
Run 'kubectl exec <pod> -- tcpdump -i eth0' to capture packets
Why this is correct
Correct: tcpdump inside the pod provides detailed network traffic capture.
Clue confirmation
The clue words "best", "first" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
Check the pod's logs using 'kubectl logs <pod>'
Why it's wrong here
Logs may not show network connections unless the application logs them.
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
Logs may not show network connections unless the application logs them.
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: Run 'kubectl exec <pod> -- tcpdump -i eth0' to capture packets — Using 'kubectl exec' with tools like tcpdump or netstat allows you to inspect network connections from within the pod. Option B is plausible but not as direct. Option C (Falco) is for runtime security but not specifically for network traffic analysis. Option D is about blocking, not investigation.
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: "best", "first". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Standard ACLs match source addresses.
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