This CKS practice question tests your understanding of system hardening. 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.
Which THREE of the following are best practices for minimizing host access from containers to reduce the attack surface? (Select three.)
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Avoid setting hostPID to true
Setting hostPID to true allows a container to share the host's process ID namespace, enabling it to see all host processes and potentially access sensitive information or perform privilege escalation. Avoiding this setting reduces the attack surface by preventing containers from interacting with host-level processes, which is a key principle of namespace isolation in Kubernetes.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Avoid setting hostPID to true
Why this is correct
hostPID gives containers access to the host process namespace, which increases risk.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Avoid setting hostNetwork to true
Why this is correct
hostNetwork allows containers to use the host network stack, increasing attack surface.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Avoid setting hostIPC to true
Why this is correct
hostIPC allows containers to access host IPC resources, which can be exploited.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable swap on nodes
Why it's wrong here
Disabling swap is a general node security recommendation but not specifically about host access from containers.
✗
Avoid using hostPort in container port mappings
Why it's wrong here
hostPort is a networking feature that does not increase host access risk significantly.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between host access (namespace sharing) and host exposure (port mapping or resource limits), so candidates may mistakenly select options like hostPort or swap disabling as host access controls when they are actually about network exposure or system performance.
Detailed technical explanation
How to think about this question
Under the hood, hostPID, hostNetwork, and hostIPC are Linux namespace configurations that, when set to true, cause the container to share the host's PID, network, and IPC namespaces respectively. This breaks the isolation that containers normally provide, allowing a compromised container to interact with host processes, sniff host network traffic, or access inter-process communication mechanisms like shared memory and semaphores. In a real-world scenario, an attacker exploiting a container with hostNetwork: true could use tools like tcpdump to capture traffic on the host's network interfaces, bypassing network policies.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
System Hardening — This question tests System Hardening — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Avoid setting hostPID to true — Setting hostPID to true allows a container to share the host's process ID namespace, enabling it to see all host processes and potentially access sensitive information or perform privilege escalation. Avoiding this setting reduces the attack surface by preventing containers from interacting with host-level processes, which is a key principle of namespace isolation in Kubernetes.
What should I do if I get this CKS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". 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?
Read the scenario before looking for a memorised answer.
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Question Discussion
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