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.
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 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: []
To deny all egress traffic, a NetworkPolicy must have podSelector matching the pod and an empty egress rules list (or a rule with no to). Option B matches the pod and has no egress rules, defaulting to deny.
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.
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.
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: 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 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 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.
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: NetworkPolicy with podSelector: matchLabels: app: compromised and egress: [] — To deny all egress traffic, a NetworkPolicy must have podSelector matching the pod and an empty egress rules list (or a rule with no to). Option B matches the pod and has no egress rules, defaulting to deny.
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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Question Discussion
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