CKAD Practice Question: Application Environment, Configuration and Security
This CKAD practice question tests your understanding of application environment, configuration and security. 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 security requirement states: 'The container must drop all capabilities and add only NET_BIND_SERVICE'. Which YAML snippet correctly implements this in the securityContext?
Option B is correct because it first drops all capabilities with `drop: [ALL]` and then explicitly adds only `NET_BIND_SERVICE` via `add: ["NET_BIND_SERVICE"]`. This matches the security requirement exactly: the container starts with no capabilities and gains only the one needed to bind to privileged ports (<1024). In Kubernetes, the order of `drop` and `add` matters — dropping ALL first ensures a clean slate, then adding the specific capability.
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.
Capabilities must be specified as lists under add and drop, not as a string.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the order of `add` and `drop`, or mistakenly think that dropping `ALL` includes the capability they want to add, leading them to pick options that either drop the needed capability or add too many.
Detailed technical explanation
How to think about this question
Under the hood, Linux capabilities are implemented as bitmasks in the kernel's task struct. Dropping `ALL` clears the capability bounding set, and adding `NET_BIND_SERVICE` sets the `CAP_NET_BIND_SERVICE` bit (value 10 on x86). This is critical for containers that need to serve on port 80 or 443 without running as root. A real-world scenario is a web server container that must bind to port 80 but should have no other elevated privileges, minimizing the attack surface.
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 CKAD question in full detail.
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: securityContext:
capabilities:
drop: [ALL]
add: ["NET_BIND_SERVICE"] — Option B is correct because it first drops all capabilities with `drop: [ALL]` and then explicitly adds only `NET_BIND_SERVICE` via `add: ["NET_BIND_SERVICE"]`. This matches the security requirement exactly: the container starts with no capabilities and gains only the one needed to bind to privileged ports (<1024). In Kubernetes, the order of `drop` and `add` matters — dropping ALL first ensures a clean slate, then adding the specific capability.
What should I do if I get this CKAD 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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