SAMPLE CKS EXAM & REAL CKS EXAMS

Sample CKS Exam & Real CKS Exams

Sample CKS Exam & Real CKS Exams

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Linux Foundation CKS (Certified Kubernetes Security Specialist) Exam is a certification program that validates an individual's knowledge and skills in securing containerized applications and Kubernetes environments. Certified Kubernetes Security Specialist (CKS) certification is designed for professionals who work with Kubernetes on a daily basis and are responsible for securing the cluster and its components. The CKS exam tests the candidates' knowledge of Kubernetes security features, best practices, and common vulnerabilities. Certified Kubernetes Security Specialist (CKS) certification is ideal for security professionals, DevOps engineers, system administrators, and developers who want to enhance their skills in securing Kubernetes clusters.

To prepare for the CKS Exam, candidates are recommended to have a strong understanding of Kubernetes architecture and concepts, as well as a comprehensive knowledge of security best practices. The Linux Foundation offers a variety of training courses and resources to help candidates prepare for the exam, including online courses, study guides, and practice exams. Additionally, candidates are encouraged to gain hands-on experience working with Kubernetes clusters and implementing security measures in real-world environments.

The CKS Certification Exam is a practical assessment of the candidate's skills in securing Kubernetes platforms and containerized applications. CKS exam consists of 17 hands-on performance-based tasks that simulate real-world scenarios. The tasks are designed to test the candidate's ability to identify and mitigate security risks, implement security best practices, and troubleshoot security issues in Kubernetes environments. CKS exam is timed and must be completed within two hours. Candidates who pass the exam are awarded the CKS certification, which demonstrates their expertise in Kubernetes security and their commitment to upholding industry best practices.

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Linux Foundation Certified Kubernetes Security Specialist (CKS) Sample Questions (Q43-Q48):

NEW QUESTION # 43
Context: Cluster: gvisor Master node: master1 Worker node: worker1
You can switch the cluster/configuration context using the following command:
[desk@cli] $ kubectl config use-context gvisor
Context: This cluster has been prepared to support runtime handler, runsc as well as traditional one.
Task: Create a RuntimeClass named not-trusted using the prepared runtime handler names runsc. Update all Pods in the namespace server to run on newruntime.

Answer:

Explanation:

Explanation
[desk@cli] $vim runtime.yaml
apiVersion: node.k8s.io/v1
kind: RuntimeClass
metadata:
name: not-trusted
handler: runsc
[desk@cli] $ k apply -f runtime.yaml [desk@cli] $ k get pods
NAME READY STATUS RESTARTS AGE
nginx-6798fc88e8-chp6r 1/1 Running 0 11m
nginx-6798fc88e8-fs53n 1/1 Running 0 11m
nginx-6798fc88e8-ndved 1/1 Running 0 11m
[desk@cli] $ k get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
nginx 3/3 11 3 5m
[desk@cli] $ k edit deploy nginx


NEW QUESTION # 44
Context:
Cluster: prod
Master node: master1
Worker node: worker1
You can switch the cluster/configuration context using the following command:
[desk@cli] $ kubectl config use-context prod
Task:
Analyse and edit the given Dockerfile (based on the ubuntu:18:04 image)
/home/cert_masters/Dockerfile fixing two instructions present in the file being prominent security/best-practice issues.
Analyse and edit the given manifest file
/home/cert_masters/mydeployment.yaml fixing two fields present in the file being prominent security/best-practice issues.
Note: Don't add or remove configuration settings; only modify the existing configuration settings, so that two configuration settings each are no longer security/best-practice concerns.
Should you need an unprivileged user for any of the tasks, use user nobody with user id 65535

Answer:

Explanation:
1. For Dockerfile: Fix the image version & user name in Dockerfile
2. For mydeployment.yaml : Fix security contexts
Explanation
[desk@cli] $ vim /home/cert_masters/Dockerfile
FROM ubuntu:latest # Remove this
FROM ubuntu:18.04 # Add this
USER root # Remove this
USER nobody # Add this
RUN apt get install -y lsof=4.72 wget=1.17.1 nginx=4.2
ENV ENVIRONMENT=testing
USER root # Remove this
USER nobody # Add this
CMD ["nginx -d"]

[desk@cli] $ vim /home/cert_masters/mydeployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: kafka
name: kafka
spec:
replicas: 1
selector:
matchLabels:
app: kafka
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: kafka
spec:
containers:
- image: bitnami/kafka
name: kafka
volumeMounts:
- name: kafka-vol
mountPath: /var/lib/kafka
securityContext:
{"capabilities":{"add":["NET_ADMIN"],"drop":["all"]},"privileged": True,"readOnlyRootFilesystem": False, "runAsUser": 65535} # Delete This
{"capabilities":{"add":["NET_ADMIN"],"drop":["all"]},"privileged": False,"readOnlyRootFilesystem": True, "runAsUser": 65535} # Add This resources: {} volumes:
- name: kafka-vol
emptyDir: {}
status: {}
Pictorial View:
[desk@cli] $ vim /home/cert_masters/mydeployment.yaml


NEW QUESTION # 45
SIMULATION
Analyze and edit the given Dockerfile
FROM ubuntu:latest
RUN apt-get update -y
RUN apt-install nginx -y
COPY entrypoint.sh /
ENTRYPOINT ["/entrypoint.sh"]
USER ROOT
Fixing two instructions present in the file being prominent security best practice issues Analyze and edit the deployment manifest file apiVersion: v1 kind: Pod metadata:
name: security-context-demo-2
spec:
securityContext:
runAsUser: 1000
containers:
- name: sec-ctx-demo-2
image: gcr.io/google-samples/node-hello:1.0
securityContext:
runAsUser: 0
privileged: True
allowPrivilegeEscalation: false
Fixing two fields present in the file being prominent security best practice issues Don't add or remove configuration settings; only modify the existing configuration settings Whenever you need an unprivileged user for any of the tasks, use user test-user with the user id 5487

  • A. Send us the Feedback on it.

Answer: A


NEW QUESTION # 46
On the Cluster worker node, enforce the prepared AppArmor profile
#include <tunables/global>
profile nginx-deny flags=(attach_disconnected) {
#include <abstractions/base>
file,
# Deny all file writes.
deny /** w,
}
EOF'

  • A. Edit the prepared manifest file to include the AppArmor profile.

Answer: A

Explanation:
apiVersion: v1
kind: Pod
metadata:
name: apparmor-pod
spec:
containers:
- name: apparmor-pod
image: nginx
Finally, apply the manifests files and create the Pod specified on it.
Verify: Try to make a file inside the directory which is restricted.


NEW QUESTION # 47
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:
[controlplane@cli] $ k get pods -n nato -o yaml | grep "image: "
[controlplane@cli] $ trivy image <image-name>
[controlplane@cli] $ k delete pod <vulnerable-pod> -n nato
[desk@cli] $ ssh controlnode
[controlplane@cli] $ k get pods -n nato
NAME READY STATUS RESTARTS AGE
alohmora 1/1 Running 0 3m7s
c3d3 1/1 Running 0 2m54s
neon-pod 1/1 Running 0 2m11s
thor 1/1 Running 0 58s
[controlplane@cli] $ k get pods -n nato -o yaml | grep "image: "

[controlplane@cli] $ k delete pod thor -n nato
[controlplane@cli] $ k delete pod neon-pod -n nato Reference: https://github.com/aquasecurity/trivy
[controlplane@cli] $ k delete pod neon-pod -n nato Reference: https://github.com/aquasecurity/trivy


NEW QUESTION # 48
......

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