Quick Answer
The answer is /var/run/secrets/kubernetes.io/serviceaccount/token. This is the default mount path where Kubernetes automatically places the service account token as a signed JWT file inside every pod, allowing containerized applications to authenticate against the API server. When a pod’s code attempts to use the Kubernetes API but receives a 403 Forbidden error, it typically means the application is not reading this token file to include in its API requests, so the server rejects the unauthenticated call. On the CKAD exam, this concept tests your understanding of pod-to-API authentication mechanics, often appearing in troubleshooting scenarios where a Role binding exists but the token isn’t being used correctly. A common trap is assuming the token is an environment variable or a configmap—it is not; it is always a file at that specific path. Memory tip: think of the path as “var/run/secrets” because the token is a secret that runs with the pod.
This CKAD practice question tests your understanding of application environment, configuration and security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 pod is running with a service account that has been granted a Role to get pods. The pod's code uses the Kubernetes API from within the container. However, the API call fails with a 403 Forbidden error. Which file should the pod read to obtain the authentication token?
/var/run/secrets/kubernetes.io/serviceaccount/token
Correct. The token file is mounted at that path.
/etc/kubernetes/admin.conf
Why wrong: This is a kubeconfig file for cluster administration, not mounted in pods.
/var/run/secrets/kubernetes.io/serviceaccount/namespace
Why wrong: This file contains the namespace, not the token.
/var/run/secrets/kubernetes.io/serviceaccount/ca.crt
Why wrong: This is the CA certificate, not the token.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
/var/run/secrets/kubernetes.io/serviceaccount/token
The pod's service account token is automatically mounted at /var/run/secrets/kubernetes.io/serviceaccount/token. This token is a signed JWT that the pod uses to authenticate to the Kubernetes API server. Without reading this file, the pod cannot present valid credentials, resulting in a 403 Forbidden error.
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.
/var/run/secrets/kubernetes.io/serviceaccount/token
Why this is correct
Correct. The token file is mounted at that path.
Related concept
Read the scenario before looking for a memorised answer.
/etc/kubernetes/admin.conf
Why it's wrong here
This is a kubeconfig file for cluster administration, not mounted in pods.
/var/run/secrets/kubernetes.io/serviceaccount/namespace
Why it's wrong here
This file contains the namespace, not the token.
/var/run/secrets/kubernetes.io/serviceaccount/ca.crt
Why it's wrong here
This is the CA certificate, not the token.
Common exam traps
CNCF often tests the distinction between the token file, the CA certificate, and the namespace file — candidates confuse the token with the CA cert or think the admin kubeconfig is accessible inside the pod.
Detailed technical explanation
The service account token is a JWT signed by the Kubernetes API server's private key. When the pod's code reads this token and presents it in the Authorization header (Bearer token), the API server validates the token's signature and extracts the service account identity. The RoleBinding must correctly bind the Role to the service account; a common subtle issue is that the RoleBinding is in the wrong namespace or references the wrong service account name.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Application Environment, Configuration and Security — study guide chapter
Learn the concepts, then practise the questions
Application Environment, Configuration and Security practice questions
Targeted practice on this topic area only
All CKAD questions
991 questions across all exam domains
Certified Kubernetes Application Developer CKAD study guide
Full concept coverage aligned to exam objectives
CKAD practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise CKAD questions linked to Application Design and Build.
Practise CKAD questions linked to Application Deployment.
Practise CKAD questions linked to Application Environment, Configuration and Security.
Practise CKAD questions linked to Application Observability and Maintenance.
Practise CKAD questions linked to Services and Networking.
Practise CKAD questions linked to CKAD fundamentals.
Practise CKAD questions linked to CKAD scenario.
Practise CKAD questions linked to CKAD troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: /var/run/secrets/kubernetes.io/serviceaccount/token — The pod's service account token is automatically mounted at /var/run/secrets/kubernetes.io/serviceaccount/token. This token is a signed JWT that the pod uses to authenticate to the Kubernetes API server. Without reading this file, the pod cannot present valid credentials, resulting in a 403 Forbidden error.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A pod uses a service account 'my-sa' with a RoleBinding that grants get and list on pods in namespace 'app'. The pod runs a process that calls the Kubernetes API to list pods. However, the API call returns 403. What is the most likely cause?
hardWhy C: Option C is correct because the pod must have the service account token mounted to authenticate to the Kubernetes API server. By default, Kubernetes automatically mounts the service account token into pods via a projected volume at /var/run/secrets/kubernetes.io/serviceaccount/token. If the pod is configured with automountServiceAccountToken: false or the token is not mounted, the API client cannot authenticate, resulting in a 403 Forbidden error even if the RoleBinding grants the correct permissions.
Last reviewed: Jun 30, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.