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The CKS Exam is intended for professionals who have experience working with Kubernetes and have a good understanding of the platform's architecture, components, and security features. CKS exam is targeted at security professionals, DevOps engineers, and system administrators who are responsible for securing Kubernetes environments. It is also suitable for individuals who are interested in learning more about Kubernetes security and want to validate their knowledge and skills in this area.

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Linux Foundation Certified Kubernetes Security Specialist (CKS) Sample Questions (Q57-Q62):

NEW QUESTION # 57
A container image scanner is set up on the cluster.
Given an incomplete configuration in the directory
/etc/kubernetes/confcontrol and a functional container image scanner with HTTPS endpoint https://test-server.local.8081/image_policy

A. 1. Enable the admission plugin.

Answer: A

Explanation:
2. Validate the control configuration and change it to implicit deny.
Finally, test the configuration by deploying the pod having the image tag as latest.

NEW QUESTION # 58
Create a new NetworkPolicy named deny-all in the namespace testing which denies all traffic of type ingress and egress traffic

Answer:

Explanation:
You can create a "default" isolation policy for a namespace by creating a NetworkPolicy that selects all pods but does not allow any ingress traffic to those pods.
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: default-deny-ingress
spec:
podSelector: {}
policyTypes:
- Ingress
You can create a "default" egress isolation policy for a namespace by creating a NetworkPolicy that selects all pods but does not allow any egress traffic from those pods.
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: allow-all-egress
spec:
podSelector: {}
egress:
- {}
policyTypes:
- Egress
Default deny all ingress and all egress traffic
You can create a "default" policy for a namespace which prevents all ingress AND egress traffic by creating the following NetworkPolicy in that namespace.
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: default-deny-all
spec:
podSelector: {}
policyTypes:
- Ingress
- Egress
This ensures that even pods that aren't selected by any other NetworkPolicy will not be allowed ingress or egress traffic.

NEW QUESTION # 59
Create a User named john, create the CSR Request, fetch the certificate of the user after approving it.
Create a Role name john-role to list secrets, pods in namespace john
Finally, Create a RoleBinding named john-role-binding to attach the newly created role john-role to the user john in the namespace john. To Verify: Use the kubectl auth CLI command to verify the permissions.

Answer:

Explanation:
se kubectl to create a CSR and approve it.
Get the list of CSRs:
kubectl get csr
Approve the CSR:
kubectl certificate approve myuser
Get the certificate
Retrieve the certificate from the CSR:
kubectl get csr/myuser -o yaml
here are the role and role-binding to give john permission to create NEW_CRD resource:
kubectl apply -f roleBindingJohn.yaml --as=john
rolebinding.rbac.authorization.k8s.io/john_external-rosource-rb created kind: RoleBinding apiVersion: rbac.authorization.k8s.io/v1 metadata:
name: john_crd
namespace: development-john
subjects:
- kind: User
name: john
apiGroup: rbac.authorization.k8s.io
roleRef:
kind: ClusterRole
name: crd-creation
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: crd-creation
rules:
- apiGroups: ["kubernetes-client.io/v1"]
resources: ["NEW_CRD"]
verbs: ["create, list, get"]

NEW QUESTION # 60
You are running a Kubernetes cluster in AWS with a workload that involves sensitive data processing. You suspect that some of your pods might be compromised and are leaking data to an external server. You need to identify the compromised pods and isolate them from the network. Explain the steps you would take to achieve this, including the tools and techniques you would use to monitor network traffic, identify suspicious activity, and isolate compromised pods.

Answer:

Explanation:
Solution (Step by Step):
1. Enable Network Policy: Start by enabling network policies in your Kubernetes cluster. This will restrict network traffic between pods based on predefined rules.
Implementation:

2. Monitor Network Traffic with tools like: Kubernetes Network Policy: Analyze the network policies configured on your cluster to identify any potentially suspicious traffic patterns. Kube-Proxy: Use 'kubectl proxy' to monitor the network traffic within your cluster. Observe incoming and outgoing traffic to identify any unusual patterns. Network Security Monitoring Tools: Consider using dedicated network security monitoring tools like Suricata, Zeek, or tcpdump for more comprehensive network analysis. Implementation: bash kubectl proxy --port=8001 # Start kubectl proxy # In a separate terminal, run the following command to view traffic to a specific pod: curl -v http://localhost.'8001/api/v1/namespaces/default/pods//proxy/ # Analyze the output to identify suspicious traffic. 3. Analyze Logs for Suspicious Activity: Kubernetes Logs: I-Ise tools like ' kubectl logs to inspect the logs of your pods, especially those related to data processing. Look for signs of unauthorized access, data exfiltration attempts, or unusual activity patterns. Security Logging: Configure your cluster to collect security-related events and logs in a centralized logging system like Elasticsearch, Fluentd, and Kibana (EFK) stack. Security Monitoring Tools: Employ tools like Falco or Auditd to actively monitor and analyze security-related events within your Kubernetes cluster. Implementation: bash kubectl logs -f # View logs of the pod 4. Isolate Compromised Pods: Network Segmentation: Use network policies to restrict the network access of suspected pods. Pod Disruption Budget (PDB): Ensure that your workload doesn't become unavailable during the isolation process. Service Disruption: If the compromised pod belongs to a service, consider temporarily removing it from the service's endpoint list to isolate the compromised service instance. Implementation:

5. Investigate and Remediate: Root Cause Analysis: Once the compromised pod is isolated, perform a thorough analysis to determine the cause of the compromise. This may involve examining system logs, network traffic, and potentially performing forensic analysis on the compromised pod Security Remediation: Address the root cause of the compromise by patching vulnerabilities, updating security configurations, and nardening your systems. Recovery and Restoration: If necessary, recover data that may have been leaked and restore your system to a secure state. Implementation: bash # Investigate the cause of the compromise: kubectl logs -f # Analyze the network traffic related to the pod using kubectl proxy and network monitoring tools. # Remediate the compromise: kubectl delete pod # Replace with the name of the compromised pod # Update security configurations # Patch vulnerabilities # Consider using a new container image with updated security measures # Restore data if necessary

NEW QUESTION # 61
You are setting up a Kubernetes cluster that requires strong security measures. You need to implement several security best practices, including.
- Pod Security Policy: Implement a default Pod Security Policy that restricts resource requests, limits privilege escalation, and disables container root access.
- Network Policy: Configure network policies to restrict communication between pods within the cluster, enforcing a principle of least privilege.
- Admission Controller: Use the 'PodSecurityPolicys admission controller to enforce the defined Pod Security Policy rules.
How would you set up a secure Kubernetes cluster, including the configuration of a default Pod Security Policy, network policies, and the 'PodSecuntyP01icy' admission controller, to enforce these security best practices?

Answer:

Explanation:
Solution (Step by Step) :
1. Create a Default Pod Security Policy:
- Create a YAML file named 'psp.yaml' with the following content:

2. Create Network Policies: - Create separate YAML files for each network policy you need. - For example, a policy to restrict communication between pods in the 'frontend' and 'backend' namespaces could be defined as:

3. Enable the 'PodSecurityPolicy' Admission Controller: - Modify the Kubernetes API server configuration (e.g., vetc'kubernetes/manifests/kube-apiserver.yaml') to enable the 'PodSecurityPolicy' admission controller: - Add the following line: '--admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,PodSecurityPolicy' 4. Apply the Configuration: - Apply the 'psp.yaml' and network policy files to the cluster using 'kubectl apply -f -yamr - Restart the Kubernetes API server for the changes to take effect. 5. Test the Configuration: - Try to create a pod that violates the Pod Security Policy rules. - You should see an error message indicating that the PodSecurityPolicy is preventing the pod creatiom - Test the network policies by attempting to communicate between pods and verifying that traffic is restricted according to the defined rules. 6. Monitor and Adjust - Monitor the cluster for any potential issues caused by the security policies. - Adjust the policies as needed based on evolving security requirements and application needs. Note: It's recommended to use a tool like 'kubectl apply -f -s to pipe the content of the YAML files to the command for applying the resources.

NEW QUESTION # 62
......

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Linux Foundation Certified Kubernetes Security Specialist (CKS) Sample Questions (Q57-Q62):

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