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Linux Foundation Kubernetes and Cloud Native Security Associate Sample Questions (Q18-Q23):

NEW QUESTION # 18
Which of the following is a valid security risk caused by having no egress controls in a Kubernetes cluster?

Answer: D

Explanation:
* Egress NetworkPoliciesrestrict outbound traffic from Pods.
* Without egress restrictions, a compromised Pod could exfiltrate sensitive data (secrets, logs, customer data) to an attacker-controlled server.
* Exact extract (Kubernetes Docs - Network Policies):
* "Egress rules control outbound connections from Pods. Without such restrictions, compromised workloads can connect freely to external endpoints."
* Other options clarified:
* A: DoS is more about flooding, not egress absence.
* C: "Increased attack surface" is vague but not the main risk.
* D: True in a sense, but the precise and most common risk isdata exfiltration.
References:
Kubernetes Docs - Network Policies: https://kubernetes.io/docs/concepts/services-networking/network- policies/


NEW QUESTION # 19
Given a standard Kubernetes cluster architecture comprising a single control plane node (hosting bothetcdand the control plane as Pods) and three worker nodes, which of the following data flows crosses atrust boundary
?

Answer: A

Explanation:
* Trust boundariesexist where data flows between different security domains.
* In Kubernetes:
* Communication between thekubelet (node agent)and theAPI Server (control plane)crosses the node-to-control-plane trust boundary.
* (A) Kubelet to container runtime is local, no boundary crossing.
* (C) Kubelet does not communicate directly with the controller manager.
* (D) API server does not talk directly to the container runtime; it delegates to kubelet.
* Therefore, (B) is the correct trust boundary crossing flow.
References:
CNCF Security Whitepaper - Kubernetes Threat Model: identifies node-to-control-plane communications (kubelet # API Server) as crossing trust boundaries.
Kubernetes Documentation - Cluster Architecture


NEW QUESTION # 20
An attacker has successfully overwhelmed the Kubernetes API server in a cluster with a single control plane node by flooding it with requests.
How would implementing a high-availability mode with multiple control plane nodes mitigate this attack?

Answer: C

Explanation:
* Inhigh-availability clusters, multiple API server instances run behind a load balancer.
* Thisdistributes client requests across multiple API servers, preventing a single API server from being overwhelmed.
* Exact extract (Kubernetes Docs - High Availability Clusters):
* "A highly available control plane runs multiple instances of kube-apiserver, typically fronted by a load balancer, so that if one instance fails or is overloaded, others continue serving requests."
* Other options clarified:
* A: Network segmentation does not directly mitigate API server DoS.
* C: Adding resources helps, but doesn't solve single-point-of-failure.
* D: Rate limiting is a valid mitigation but not provided by HA alone.
References:
Kubernetes Docs - Building High-Availability Clusters: https://kubernetes.io/docs/setup/production- environment/tools/kubeadm/high-availability/


NEW QUESTION # 21
Which technology can be used to apply security policy for internal cluster traffic at the application layer of the network?

Answer: B

Explanation:
* Service Mesh (e.g., Istio, Linkerd, Consul):operates atLayer 7 (application layer), enforcing policies like mTLS, authorization, and routing between services.
* NetworkPolicy:works atLayer 3/4 (IP/port), not Layer 7.
* Ingress Controller:handles external traffic ingress, not internal service-to-service traffic.
* Container Runtime:responsible for running containers, not enforcing application-layer security.
Exact extract (Istio docs):
* "Istio provides security by enforcing authentication, authorization, and encryption of service-to- service communication." References:
Kubernetes Docs - Network Policies: https://kubernetes.io/docs/concepts/services-networking/network- policies/ Istio Security Docs: https://istio.io/latest/docs/concepts/security/


NEW QUESTION # 22
On a client machine, what directory (by default) contains sensitive credential information?

Answer: B

Explanation:
* Thekubectlclient uses configuration from$HOME/.kube/configby default.
* This file contains: cluster API server endpoint, user certificates, tokens, or kubeconfigs #sensitive credentials.
* Exact extract (Kubernetes Docs - Configure Access to Clusters):
* "By default, kubectl looks for a file named config in the $HOME/.kube directory. This file contains configuration information including user credentials."
* Other options clarified:
* A: /etc/kubernetes/ exists on nodes (control plane) not client machines.
* C: /opt/kubernetes/secrets/ is not a standard path.
* D: $HOME/.config/kubernetes/ is not where kubeconfig is stored by default.
References:
Kubernetes Docs - Configure Access to Clusters: https://kubernetes.io/docs/concepts/configuration/organize- cluster-access-kubeconfig/


NEW QUESTION # 23
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