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 developer runs 'kubectl create secret generic tls-secret --cert=cert.crt --key=key.pem'. What type of Secret is created?
kubernetes.io/tls
The --cert and --key flags are specifically for creating TLS secrets.
Opaque
Why wrong: Opaque would be created if using --from-literal or --from-file without the --cert/--key flags.
kubernetes.io/dockerconfigjson
Why wrong: This type is for Docker registry credentials.
kubernetes.io/ssh-auth
Why wrong: SSH auth secrets are created with --ssh-key flag.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
kubernetes.io/tls
The command `kubectl create secret generic tls-secret --cert=cert.crt --key=key.pem` creates a Secret of type `kubernetes.io/tls`. This is because the `--cert` and `--key` flags automatically set the type to TLS, which is used to store TLS certificates and private keys for ingress or other TLS termination. The `generic` subcommand is a misnomer here; it does not create an Opaque secret when these specific flags are provided.
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.
kubernetes.io/tls
Why this is correct
The --cert and --key flags are specifically for creating TLS secrets.
Related concept
Read the scenario before looking for a memorised answer.
Opaque
Why it's wrong here
Opaque would be created if using --from-literal or --from-file without the --cert/--key flags.
kubernetes.io/dockerconfigjson
Why it's wrong here
This type is for Docker registry credentials.
kubernetes.io/ssh-auth
Why it's wrong here
SSH auth secrets are created with --ssh-key flag.
Common exam traps
The trap here is that candidates assume `kubectl create secret generic` always creates an Opaque secret, but the `--cert` and `--key` flags automatically change the type to `kubernetes.io/tls`, which is a common point of confusion in CKAD exams.
Detailed technical explanation
Under the hood, the `kubectl create secret generic` command with `--cert` and `--key` automatically sets the `type` field in the Secret manifest to `kubernetes.io/tls` and encodes the certificate and key as `tls.crt` and `tls.key` data keys, respectively. This type is recognized by Kubernetes ingress controllers and other components to automatically mount the certificate for TLS termination. A subtle behavior is that the key file must be in PEM format (unencrypted), and the certificate must be PEM-encoded; otherwise, the command will fail or produce an invalid secret.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
The correct answer is: kubernetes.io/tls — The command `kubectl create secret generic tls-secret --cert=cert.crt --key=key.pem` creates a Secret of type `kubernetes.io/tls`. This is because the `--cert` and `--key` flags automatically set the type to TLS, which is used to store TLS certificates and private keys for ingress or other TLS termination. The `generic` subcommand is a misnomer here; it does not create an Opaque secret when these specific flags are provided.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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.
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