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 of the following host access settings should be disabled to reduce the attack surface of a container?
hostNetwork: true
Why wrong: hostNetwork: true gives container direct access to host network, increasing attack surface.
hostPID: true
Why wrong: hostPID: true allows container to see host processes, increasing attack surface.
hostIPC: true
Why wrong: hostIPC: true allows container to access host IPC, increasing attack surface.
hostPID: false
Setting hostPID to false disables access to host processes, reducing attack surface.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
hostPID: false
Option D is correct because setting `hostPID: false` explicitly disables the container's access to the host's process ID namespace, which reduces the attack surface by preventing the container from seeing or interacting with host processes. In Kubernetes, when `hostPID` is set to `true`, the container shares the host's PID namespace, allowing it to potentially escalate privileges or interfere with other workloads. Disabling this setting (i.e., `false`) is a recommended security best practice to enforce process isolation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
hostNetwork: true
Why it's wrong here
hostNetwork: true gives container direct access to host network, increasing attack surface.
hostPID: true
Why it's wrong here
hostPID: true allows container to see host processes, increasing attack surface.
hostIPC: true
Why it's wrong here
hostIPC: true allows container to access host IPC, increasing attack surface.
hostPID: false
Why this is correct
Setting hostPID to false disables access to host processes, reducing attack surface.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse the boolean value that should be set to disable the feature (i.e., `false`) with the dangerous setting itself (i.e., `true`), so they might incorrectly select `hostPID: true` as the answer to disable, when the question explicitly asks for the disabled setting.
Detailed technical explanation
Under the hood, Linux namespaces provide isolation for processes, and when `hostPID: true` is set, the container's processes are visible in the host's `/proc` filesystem, enabling a container to list all host processes and potentially send signals (e.g., SIGKILL) to them if it has sufficient capabilities. In a real-world scenario, a compromised container with `hostPID: true` could use tools like `ps` or `cat /proc/1/environ` to extract sensitive host environment variables, leading to lateral movement. The `securityContext` in a Pod spec controls this via the `hostPID` field, and setting it to `false` (the default) ensures the container gets its own PID namespace.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
System Hardening — This question tests System Hardening — Read the scenario before looking for a memorised answer..
The correct answer is: hostPID: false — Option D is correct because setting `hostPID: false` explicitly disables the container's access to the host's process ID namespace, which reduces the attack surface by preventing the container from seeing or interacting with host processes. In Kubernetes, when `hostPID` is set to `true`, the container shares the host's PID namespace, allowing it to potentially escalate privileges or interfere with other workloads. Disabling this setting (i.e., `false`) is a recommended security best practice to enforce process isolation.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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