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.
To reduce the attack surface, a security best practice is to drop all capabilities from a container and add only those required. Which securityContext field is used to drop all capabilities?
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.
capabilities.disable: ["ALL"]
Why wrong: There is no 'disable' field.
capabilities.remove: ["ALL"]
Why wrong: There is no 'remove' field; the correct field is 'drop'.
capabilities.drop: ["ALL"]
This correctly drops all capabilities from the container.
privileged: false
Why wrong: Setting privileged: false is not the same as dropping capabilities.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
capabilities.drop: ["ALL"]
In Kubernetes, the `capabilities.drop` field in the securityContext is used to explicitly remove Linux capabilities from a container. Setting `capabilities.drop: ["ALL"]` drops all capabilities, effectively reducing the attack surface by ensuring the container starts with no privileges, and then specific capabilities can be added back via `capabilities.add` if needed.
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.
capabilities.disable: ["ALL"]
Why it's wrong here
There is no 'disable' field.
capabilities.remove: ["ALL"]
Why it's wrong here
There is no 'remove' field; the correct field is 'drop'.
capabilities.drop: ["ALL"]
Why this is correct
This correctly drops all capabilities from the container.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
privileged: false
Why it's wrong here
Setting privileged: false is not the same as dropping capabilities.
Common exam traps
CNCF often tests the exact Kubernetes API field name `capabilities.drop` versus common but incorrect synonyms like `disable` or `remove`, and candidates may confuse dropping all capabilities with simply disabling privileged mode.
Detailed technical explanation
Under the hood, the `capabilities.drop` field translates to the `--cap-drop` flag in the container runtime (e.g., Docker or containerd), which modifies the bounding set of capabilities for the container process. Dropping ALL capabilities is a common hardening practice for workloads that do not require any kernel-level privileges, such as web servers or application containers, and is often combined with a read-only root filesystem and seccomp profiles for defense in depth.
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: capabilities.drop: ["ALL"] — In Kubernetes, the `capabilities.drop` field in the securityContext is used to explicitly remove Linux capabilities from a container. Setting `capabilities.drop: ["ALL"]` drops all capabilities, effectively reducing the attack surface by ensuring the container starts with no privileges, and then specific capabilities can be added back via `capabilities.add` if needed.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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