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CKS Monitoring, Logging and Runtime Security Practice Question
This CKS practice question tests your understanding of monitoring, logging and runtime security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 developer reports that a pod cannot reach an external database at 192.168.1.100:3306. The pod's namespace is 'app'. You need to create a NetworkPolicy that allows egress to that IP only. Which policy is correct?
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
✓
apiVersion: networking.k8s.io/v1 kind: NetworkPolicy metadata: name: allow-egress namespace: app spec: podSelector: {} egress: - to: - ipBlock: cidr: 192.168.1.100/32 ports: - port: 3306 protocol: TCP policyTypes: - Egress
The NetworkPolicy must allow egress to the specific IP and port. Option B uses podSelector: {} to apply to all pods in the namespace, egress rules to destination IP and port. Option A is missing the port specification. Option C applies to pods with label 'app', not all. Option D uses both ingress and egress incorrectly.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CKS subnetting questions on CIDR, address ranges, and subnet selection.
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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 — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: apiVersion: networking.k8s.io/v1 kind: NetworkPolicy metadata: name: allow-egress namespace: app spec: podSelector: {} egress: - to: - ipBlock: cidr: 192.168.1.100/32 ports: - port: 3306 protocol: TCP policyTypes: - Egress — The NetworkPolicy must allow egress to the specific IP and port. Option B uses podSelector: {} to apply to all pods in the namespace, egress rules to destination IP and port. Option A is missing the port specification. Option C applies to pods with label 'app', not all. Option D uses both ingress and egress incorrectly.
What should I do if I get this CKS question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CKS subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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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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