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.
A pod spec includes 'hostPID: true' and 'hostNetwork: true'. What security concern does this raise?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The container can see all host processes and access the host network namespace, increasing the risk of privilege escalation
Setting `hostPID: true` allows the container to see all processes running on the host, which can leak sensitive information and enable process injection. Setting `hostNetwork: true` gives the container direct access to the host's network namespace, bypassing network policies and potentially allowing the container to bind to privileged ports or sniff traffic. Together, these settings significantly increase the attack surface and risk of privilege escalation or host compromise.
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.
✗
The container can use the host's GPU and other devices
Why it's wrong here
Device access requires other configurations (e.g., device plugins).
✓
The container can see all host processes and access the host network namespace, increasing the risk of privilege escalation
Why this is correct
HostPID allows viewing processes, and hostNetwork allows using the host network stack, which can be abused.
Related concept
Read the scenario before looking for a memorised answer.
✗
The container can read and write to the host filesystem
Why it's wrong here
Host filesystem access requires hostPath volume mounts, not hostPID or hostNetwork.
✗
The container cannot use a securityContext
Why it's wrong here
The container can still have a securityContext; however, some settings may conflict.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between namespace sharing (`hostPID`, `hostNetwork`, `hostIPC`) and volume mounts or device access; the trap here is that candidates confuse `hostNetwork` with host filesystem access or assume `hostPID` implies device access.
Detailed technical explanation
How to think about this question
Under the hood, `hostPID: true` sets the container's PID namespace to the host's PID namespace, meaning the container's `/proc` exposes all host processes. `hostNetwork: true` sets the container's network namespace to the host's, so the container shares the host's network stack, including interfaces, routes, and iptables rules. In a real-world scenario, an attacker who compromises such a container could use tools like `nsenter` or `ptrace` to interact with host processes or launch a man-in-the-middle attack on host network traffic.
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: The container can see all host processes and access the host network namespace, increasing the risk of privilege escalation — Setting `hostPID: true` allows the container to see all processes running on the host, which can leak sensitive information and enable process injection. Setting `hostNetwork: true` gives the container direct access to the host's network namespace, bypassing network policies and potentially allowing the container to bind to privileged ports or sniff traffic. Together, these settings significantly increase the attack surface and risk of privilege escalation or host compromise.
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.
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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