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The CKS Certification is aimed at IT professionals who work with Kubernetes and containerized applications, including security professionals, DevOps engineers, system administrators, and developers. Certified Kubernetes Security Specialist (CKS) certification requires candidates to demonstrate their expertise in various Kubernetes security topics, such as securing Kubernetes components, securing container images, securing network communication, and implementing security policies.

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Often candidates fail the CKS exam due to the fact that they do not know the tactics of attempting the Certified Kubernetes Security Specialist (CKS) (CKS) exam in an ideal way. The decisive part is often effective time management. Some Linux Foundation CKS Exam Questions demand more attention than others, which disturbs the time allotted to each topic. The best way to counter them is to use an updated CKS Dumps.

The CKS Exam is a vendor-neutral certification, meaning that it is not tied to any specific vendor or technology. This makes it an ideal certification for security professionals who work with Kubernetes platforms and containerized workloads regardless of the vendor or technology used. Certified Kubernetes Security Specialist (CKS) certification is also recognized globally, making it a valuable asset for security professionals seeking to advance their careers in the Kubernetes and containerization space.

Linux Foundation Certified Kubernetes Security Specialist (CKS) Sample Questions (Q21-Q26):

NEW QUESTION # 21
SIMULATION
Cluster: scanner
Master node: controlplane
Worker node: worker1
You can switch the cluster/configuration context using the following command:
[desk@cli] $ kubectl config use-context scanner
Given:
You may use Trivy's documentation.
Task:
Use the Trivy open-source container scanner to detect images with severe vulnerabilities used by Pods in the namespace nato.
Look for images with High or Critical severity vulnerabilities and delete the Pods that use those images.
Trivy is pre-installed on the cluster's master node. Use cluster's master node to use Trivy.

Answer:

Explanation:
See the Explanation below
Explanation:




NEW QUESTION # 22
You are running a Kubernetes cluster with a variety of workloads. One of your applications is a database that stores sensitive customer data- To enhance security, you need to implement network policies to limit the network traffic to and from this database pod. Specifically, you want to only allow access to the database from your application pods and deny all other traffic.
Create a NetworkPolicy that accomplishes this objective.

Answer:

Explanation:
Solution (Step by Step) :
1. Define the NetworkPolicy:
- Create a NetworkPoIicy YAML file.
- Define the policy name and target pods.
- Specify the ingress and egress rules.
- Example:

2. Apply the NetworkPolicy: - IJse ' kubectl apply -f database-policy-yamp to apply the policy. 3. Verification: - Verity that the NetworkPolicy is applied successfully- - Use 'kubectl get networkpolicies' to list the existing policies. 4. Test the Policy: - Attempt to access the database pod from a pod outside of the 'application' label. - The access should be denied due to the NetworkPolicy.


NEW QUESTION # 23
You are deploying a critical application Within your Kubernetes cluster. The application requires access to sensitive data stored in a secret. You want to implement a policy that ensures only authorized pods can access the secret How can you restrict access to the secret to authorized pods?

Answer:

Explanation:
Solution (Step by Step) :
1. Create a Role and RoIeBinding:
- Define a Role that grants access to the specific secret
- Create a RoleBinding that associates the Role with a ServiceAccount that will be used by authorized pods.
2. Example Implementation:
-

3. Granting Access to a Specific Secret: - If you need to restrict access to a specific secret, add a resourceNameS field to the Role definition. 4. Fine-Grained Access Control: - To control access even more granularly, you can define custom RBAC resources using CRDs and custom validation logic.


NEW QUESTION # 24
SIMULATION
Documentation Deployment, Pod, Namespace
You must connect to the correct host . Failure to do so may result in a zero score.
[candidate@base] $ ssh cks000028
Context
You must update an existing Pod to ensure the immutability of its containers.
Task
Modify the existing Deployment named lamp-deployment, running in namespace lamp, so that its containers:
. run with user ID 20000
. use a read-only root filesystem
. forbid privilege escalation
The Deployment's manifest file con be found at /home/candidate/finer-sunbeam/lamp-deployment.yaml.

Answer:

Explanation:
See the Explanation below for complete solution
Explanation:
1) Connect to the correct host
ssh cks000028
sudo -i
2) Use the right kubeconfig (safe in exam)
export KUBECONFIG=/etc/kubernetes/admin.conf
3) Open the provided Deployment manifest
vi /home/candidate/finer-sunbeam/lamp-deployment.yaml
4) Edit ONLY the Pod template security settings (add/modify these fields) Inside:
spec: -> template: -> spec:
4.1 Set container to run as user 20000
Add (or change) under the container securityContext::
securityContext:
runAsUser: 20000
4.2 Make root filesystem read-only
In the SAME container securityContext: ensure:
readOnlyRootFilesystem: true
4.3 Forbid privilege escalation
In the SAME container securityContext: ensure:
allowPrivilegeEscalation: false
✅ The container section should look like this (example - keep your existing image/ports/etc):
spec:
template:
spec:
containers:
- name: <your-container-name>
image: <unchanged>
securityContext:
runAsUser: 20000
readOnlyRootFilesystem: true
allowPrivilegeEscalation: false
If there are multiple containers, apply the same securityContext to each container.
Save and exit:
:wq
5) Apply the manifest (updates Deployment -> recreates Pods)
kubectl -n lamp apply -f /home/candidate/finer-sunbeam/lamp-deployment.yaml
6) Wait for rollout
kubectl -n lamp rollout status deployment/lamp-deployment
7) Verify the security settings are live
7.1 Check the Pod is running
kubectl -n lamp get pods -l app=lamp -o wide
(if label differs, just kubectl -n lamp get pods)
7.2 Verify the three fields on a running Pod
Pick the Pod name and run:
POD=$(kubectl -n lamp get pods -o jsonpath='{.items[0].metadata.name}') kubectl -n lamp get pod $POD -o jsonpath='{.spec.containers[0].securityContext.runAsUser}{" "}{.spec.containers[0].securityContext.readOnlyRootFilesystem}{" "}{.spec.containers[0].securityContext.allowPrivilegeEscalation}{" "}' Expected output:
20000
true
false
If the pod fails after readOnlyRootFilesystem=true
Don't change the requirement (task demands it). Usually the app needs writable dirs via volumes, but the task doesn't ask for that-so only adjust if the manifest already has volumes and just needs these securityContext fields.


NEW QUESTION # 25
SIMULATION
You must connect to the correct host . Failure to do so may
result in a zero score.
[candidato@base] $ ssh cks000023
Task
Analyze and edit the Dockerfile located at /home/candidate/subtle-bee/build/Dockerfile, fixing one instruction present in the file that is a prominent security/best-practice issue.
Do not add or remove instructions; only modify the one existing instruction with a security/best-practice concern.
Do not build the Dockerfile, Failure to do so may result in running out of storage and a zero score.
Analyze and edit the given manifest file /home/candidate/subtle-bee/deployment.yaml, fixing one fields present in the file that are a prominent security/best-practice issue.
Do not add or remove fields; only modify the one existing field with a security/best-practice concern.
Should you need an unprivileged user for any of the tasks, use user nobody with user ID 65535.

Answer:

Explanation:
See the Explanation below for complete solution
Explanation:
0) Connect to the correct host
ssh cks000023
sudo -i
PART A - Fix ONE prominent Dockerfile security/best-practice issue
1) Open the Dockerfile
vi /home/candidate/subtle-bee/build/Dockerfile
2) Find the "most obvious" security/best-practice problem and modify ONLY THAT ONE instruction Use / search in vi to quickly find candidates:
Candidate 1 (very common): USER root (or no USER but a USER 0)
Search:
/USER
If you see:
USER root
Change that single instruction to:
USER 65535
(or USER nobody if that exact word is already used in the file-but the task explicitly allows UID 65535, so USER 65535 is safest.)
✅ This is one-instruction change and is a top-tier best practice.
Candidate 2 (very common): FROM <image>:latest
Search:
/FROM
If you see something like:
FROM nginx:latest
Change ONLY that line to a pinned tag (example):
FROM nginx:1.25.5
(Any non-latest pinned version is the point. Don't add a digest line; just modify the existing FROM line.) Candidate 3: ADD http://... (remote URL download) Search:
/ADD
If you see remote URL usage like:
ADD https://example.com/app.tar.gz /app/
Change that single instruction to COPY only if it's copying local files.
If it's a remote URL, the more "correct" fix would normally be using curl with verification, but that would require adding instructions (not allowed).
So in this exam constraint, do NOT pick this unless it's actually a local add like:
ADD . /app
Then change just the word:
COPY . /app
3) Save and exit
:wq
Don't run docker build (task forbids building).
PART B - Fix ONE prominent security/best-practice issue in the Deployment manifest
4) Open the manifest
vi /home/candidate/subtle-bee/deployment.yaml
5) Change ONLY ONE existing field that is a clear security issue
Use / search in vi for the usual "bad fields":
Option 1 (most common): running as root
Search:
/runAsUser
If you see:
runAsUser: 0
Change that one existing field value to:
runAsUser: 65535
✅ This is a single-field change and matches the prompt hint.
Option 2: privileged container
Search:
/privileged
If you see:
privileged: true
Change only that value to:
privileged: false
Option 3: allow privilege escalation
Search:
/allowPrivilegeEscalation
If you see:
allowPrivilegeEscalation: true
Change only that value to:
allowPrivilegeEscalation: false
Option 4: writable root filesystem
Search:
/readOnlyRootFilesystem
If you see:
readOnlyRootFilesystem: false
Change only that value to:
readOnlyRootFilesystem: true
Option 5: image uses :latest
Search:
/image:
If you see:
image: something:latest
Change only that value to a pinned tag, e.g.:
image: something:1.2.3
6) Save and exit
:wq
What to pick (fast decision rule)
If you see run as root in either file, that's usually the highest scoring / most "prominent" security issue.
Dockerfile: USER root → USER 65535
Deployment: runAsUser: 0 → runAsUser: 65535
Those are perfect because you only modify one line/field and it matches the hint.


NEW QUESTION # 26
......

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