The correct answer is `kubectl create secret tls tls-secret --cert=cert.pem --key=key.pem` because the `kubectl create secret tls` subcommand is purpose-built for generating a TLS secret from a certificate and private key pair, using the `--cert` and `--key` flags to specify the respective files. This command creates a Secret of type `kubernetes.io/tls`, which stores the certificate and key as base64-encoded data under the `tls.crt` and `tls.key` keys, making it directly consumable by an Ingress resource. On the CKAD exam, this task tests your ability to secure ingress traffic using TLS, a common scenario where you must quickly provision a secret from local files. A frequent trap is confusing this with `kubectl create secret generic` or misordering the flags, but remember the mnemonic: "TLS needs both a cert and a key, so use `--cert` and `--key` together."
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 kubectl command creates a Secret named 'tls-secret' from a TLS certificate file 'cert.pem' and private key file 'key.pem'?
Option B is correct because the `kubectl create secret tls` command is specifically designed to create a TLS secret from a certificate and private key pair. The correct flags are `--cert` for the certificate file and `--key` for the private key file, matching the usage shown in option B.
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 docker-registry type is for Docker credentials, not TLS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the `--cert` and `--key` flags with similar flags from other tools (like OpenSSL) or assume `--certificate` is the correct flag, leading them to choose option A, or they mistakenly use `generic` instead of `tls` for TLS secrets, as in option C.
Detailed technical explanation
How to think about this question
A TLS secret in Kubernetes stores the certificate and private key under the keys `tls.crt` and `tls.key` respectively, which is automatically handled by the `kubectl create secret tls` command. This is distinct from generic secrets, which store arbitrary key-value pairs. In production, TLS secrets are commonly used for Ingress controllers to terminate HTTPS, and the certificate must be in PEM format; the command will fail if the files are not valid PEM-encoded data.
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 practitioner preparing for the CKAD exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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 tls-secret --cert=cert.pem --key=key.pem — Option B is correct because the `kubectl create secret tls` command is specifically designed to create a TLS secret from a certificate and private key pair. The correct flags are `--cert` for the certificate file and `--key` for the private key file, matching the usage shown in option B.
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.
About these practice questions
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Why D: Option D is correct because `kubectl create secret tls` is the dedicated command for creating a TLS secret, and it uses the `--cert` and `--key` flags to specify the certificate and private key files respectively. This creates a Secret of type `kubernetes.io/tls`, which is required for Ingress resources to terminate HTTPS traffic.
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This CKAD practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CKAD exam.
Question Discussion
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