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.
You have a Secret of type kubernetes.io/tls. The pod mounting it as a volume expects the files 'tls.crt' and 'tls.key'. What keys must the Secret data contain?
ca.crt and tls.key
Why wrong: ca.crt is optional.
tls.crt and tls.key
These are the required data keys for tls secrets.
cert and key
Why wrong: Not standard.
certificate and key
Why wrong: Not the standard keys.
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
For a Secret of type `kubernetes.io/tls`, the Kubernetes API server expects the data to contain exactly the keys `tls.crt` and `tls.key`. When such a Secret is mounted as a volume into a pod, the files created in the mount path are named `tls.crt` and `tls.key`, matching these keys. This is enforced by the Kubernetes TLS secret controller and is documented in the official Kubernetes reference for TLS secrets.
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.
tls.crt and tls.key
Why this is correct
These are the required data keys for tls secrets.
Related concept
Read the scenario before looking for a memorised answer.
cert and key
Why it's wrong here
Not standard.
certificate and key
Why it's wrong here
Not the standard keys.
Common exam traps
The trap here is that candidates confuse the generic concept of a certificate and key with the exact key names required by the `kubernetes.io/tls` secret type, leading them to choose options like `cert` and `key` or `certificate` and `key` instead of the mandatory `tls.crt` and `tls.key`.
Detailed technical explanation
Under the hood, when you create a Secret with `type: kubernetes.io/tls`, the Kubernetes API server validates that the data map contains exactly the keys `tls.crt` and `tls.key`. When mounted as a volume, the kubelet creates files with those exact key names, so the pod sees `tls.crt` and `tls.key`. A subtle behavior is that the `ca.crt` key is optional and, if present, is also mounted as a file, but it is not required for the secret to be valid. In real-world scenarios, applications like NGINX or Envoy often expect the certificate and key files to be named `tls.crt` and `tls.key`, making this naming convention critical for correct TLS termination.
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 — For a Secret of type `kubernetes.io/tls`, the Kubernetes API server expects the data to contain exactly the keys `tls.crt` and `tls.key`. When such a Secret is mounted as a volume into a pod, the files created in the mount path are named `tls.crt` and `tls.key`, matching these keys. This is enforced by the Kubernetes TLS secret controller and is documented in the official Kubernetes reference for TLS secrets.
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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