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 Secret of type kubernetes.io/tls requires two data keys. What are they?
ca.crt and tls.key
Why wrong: ca.crt is optional for CA certificates, but the required keys are tls.crt and tls.key.
certificate and key
Why wrong: These are not the standard keys for a TLS secret.
cert.crt and cert.key
Why wrong: The required keys are tls.crt and tls.key, not cert.crt and cert.key.
tls.crt and tls.key
Correct according to Kubernetes documentation.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
tls.crt and tls.key
Kubernetes requires that a Secret of type `kubernetes.io/tls` contain exactly two data keys: `tls.crt` for the TLS certificate and `tls.key` for the private key. This is mandated by the Kubernetes API specification for TLS secrets, which are used to secure ingress and other TLS-terminated endpoints.
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.
ca.crt and tls.key
Why it's wrong here
ca.crt is optional for CA certificates, but the required keys are tls.crt and tls.key.
certificate and key
Why it's wrong here
These are not the standard keys for a TLS secret.
cert.crt and cert.key
Why it's wrong here
The required keys are tls.crt and tls.key, not cert.crt and cert.key.
tls.crt and tls.key
Why this is correct
Correct according to Kubernetes documentation.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse the required key names with common file extensions or generic terms like `certificate` and `key`, but Kubernetes enforces the exact keys `tls.crt` and `tls.key` for TLS secrets.
Detailed technical explanation
When you create a TLS secret, the `tls.crt` value must be a PEM-encoded certificate chain (including any intermediate CAs), and `tls.key` must be a PEM-encoded private key. The `kubernetes.io/tls` type is recognized by ingress controllers and other components to automatically mount these files into pods or use them for TLS termination, and the key names are hardcoded in the Kubernetes source code (e.g., in the `kube-controller-manager` and ingress libraries).
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: tls.crt and tls.key — Kubernetes requires that a Secret of type `kubernetes.io/tls` contain exactly two data keys: `tls.crt` for the TLS certificate and `tls.key` for the private key. This is mandated by the Kubernetes API specification for TLS secrets, which are used to secure ingress and other TLS-terminated endpoints.
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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