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.
Which command creates a TLS secret from an existing certificate and key file?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Option A is correct because the `kubectl create secret tls` command is specifically designed to create a TLS secret from an existing certificate and key file. The `--cert` and `--key` flags directly specify the paths to the PEM-encoded certificate and private key, which Kubernetes then stores as a `kubernetes.io/tls` secret type, automatically base64-encoding the data for secure storage in etcd.
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.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the `--from-file` flag (used for generic secrets) with the `--cert` and `--key` flags (required for TLS secrets), leading them to choose option B or C, which would create a secret of the wrong type or with incorrect key mappings.
Trap categories for this question
Command / output trap
The tls subcommand uses --cert and --key, not --from-file.
Detailed technical explanation
How to think about this question
A TLS secret in Kubernetes stores the certificate and key under the keys `tls.crt` and `tls.key` respectively, and the secret type `kubernetes.io/tls` is recognized by components like Ingress controllers to terminate HTTPS traffic. The `kubectl create secret tls` command automatically maps the provided files to these keys, ensuring compatibility with TLS termination. In real-world scenarios, this is critical for securing ingress resources, as misconfigured secrets (e.g., using generic secrets with wrong key names) cause TLS handshake failures.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: kubectl create secret tls my-tls --cert=cert.pem --key=key.pem — Option A is correct because the `kubectl create secret tls` command is specifically designed to create a TLS secret from an existing certificate and key file. The `--cert` and `--key` flags directly specify the paths to the PEM-encoded certificate and private key, which Kubernetes then stores as a `kubernetes.io/tls` secret type, automatically base64-encoding the data for secure storage in etcd.
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.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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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