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| Section | Weight | Objectives |
|---|---|---|
| Cloud Native Architecture | 16% | - Cloud Native Principles
|
| Cloud Native Observability | 8% | - Monitoring & Metrics
|
| Kubernetes Fundamentals | 46% | - Containerization Basics
|
| Container Orchestration | 22% | - Networking & Storage
|
| Cloud Native Application Delivery | 8% | - Deployment Strategies
|
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NEW QUESTION # 205
In a Kubernetes cluster, which component is responsible for maintaining the desired state of applications by reconciling resources such as Deployments and ReplicaSets?
Answer: C
Explanation:
The Controller Manager runs controllers that continuously compare the current state of resources with the desired state and take corrective actions to reconcile differences, ensuring applications remain in the intended state.
NEW QUESTION # 206
What feature must a CNI support to control specific traffic flows for workloads running in Kubernetes?
Answer: A
Explanation:
To control which workloads can communicate with which other workloads in Kubernetes, you use NetworkPolicy resources-but enforcement depends on the cluster's networking implementation. Therefore, for traffic-flow control, the CNI/plugin must support Network Policies, making D correct.
Kubernetes defines the NetworkPolicy API as a declarative way to specify allowed ingress and egress traffic based on selectors (Pod labels, namespaces, IP blocks) and ports/protocols. However, Kubernetes itself does not enforce NetworkPolicy rules; enforcement is provided by the network plugin (or associated dataplane components). If your CNI does not implement NetworkPolicy, the objects may exist in the API but have no effect-Pods will communicate freely by default.
Option B (IP Address Management) is often part of CNI responsibilities, but IPAM is about assigning addresses, not enforcing L3/L4 security policy. Option A (BGP) is used by some CNIs to advertise routes (for example, in certain Calico deployments), but BGP is not the general requirement for policy enforcement. Option C (Pod Security Policy) is a deprecated/removed Kubernetes admission feature related to Pod security settings, not network flow control.
From a Kubernetes security standpoint, NetworkPolicies are a key tool for implementing least privilege at the network layer-limiting lateral movement, reducing blast radius, and segmenting environments. But they only work when the chosen CNI supports them. Thus, the correct answer is D: Network Policies.
NEW QUESTION # 207
What is a Service?
Answer: C
Explanation:
The correct answer is B: a Kubernetes Service is a stable way to expose an application running on a set of Pods. Pods are ephemeral-IPs can change when Pods are recreated, rescheduled, or scaled. A Service provides a consistent network identity (DNS name and usually a ClusterIP virtual IP) and a policy for routing traffic to the current healthy backends.
Typically, a Service uses a label selector to determine which Pods are part of the backend set. Kubernetes then maintains the corresponding endpoint data (Endpoints/EndpointSlice), and the cluster dataplane (kube-proxy or an eBPF-based implementation) forwards traffic from the Service IP/port to one of the Pod IPs. This enables reliable service discovery and load distribution across replicas, especially during rolling updates where Pods are constantly replaced.
Option A is incorrect because Service routing is not a "static mapping from a Pod to a port." It's dynamic and targets a set of Pods. Option C is too vague and misstates the concept; while Services relate to networking, they are not "the network configuration for a group of Pods" (that's closer to NetworkPolicy/CNI configuration). Option D is incorrect because Kubernetes does not automatically deploy an NGINX load balancer when you create a Service. NGINX might be used as an Ingress controller or external load balancer in some setups, but a Service is a Kubernetes API abstraction, not a specific NGINX component.
Services come in several types (ClusterIP, NodePort, LoadBalancer, ExternalName), but the core definition remains the same: stable access to a dynamic set of Pods. This is foundational for microservices and for decoupling clients from the churn of Pod lifecycles.
So, the verified correct definition is B.
NEW QUESTION # 208
What is a Dockerfile?
Answer: B
Explanation:
A Dockerfile is a text file that contains a sequence of instructions used to build a container image, so C is correct. These instructions include choosing a base image (FROM), copying files (COPY/ADD), installing dependencies (RUN), setting environment variables (ENV), defining working directories (WORKDIR), exposing ports (EXPOSE), and specifying the default startup command (CMD/ENTRYPOINT). When you run docker build (or compatible tools like BuildKit), the builder executes these instructions to produce an image composed of immutable layers.
In cloud-native application delivery, Dockerfiles (more generally, OCI image build definitions) are a key step in the supply chain. The resulting image artifact is what Kubernetes runs in Pods. Best practices include using minimal base images, pinning versions, avoiding embedding secrets, and using multi-stage builds to keep runtime images small. These practices improve security and performance, and make delivery pipelines more reliable.
Option A is incorrect because a Dockerfile is not a bash script, even though it can run shell commands through RUN. Option B is incorrect because registry destinations are handled by tooling and tagging/push commands (or CI pipeline configuration), not by the Dockerfile itself. Option D is incorrect because an image layer created by a running container is more closely related to container filesystem changes and commits; a Dockerfile is the build recipe, not a runtime-generated layer.
Although the question uses "Dockerfile," the concept maps well to OCI-based container image creation generally: you define a reproducible build recipe that produces an immutable image artifact. That artifact is then versioned, scanned, signed, stored in a registry, and deployed to Kubernetes through manifests/Helm/GitOps. Therefore, C is the correct and verified definition.
NEW QUESTION # 209
What does the livenessProbe in Kubernetes help detect?
Answer: D
Explanation:
The livenessProbe is used to detect whether a running container has become unresponsive or is in a failed state, allowing Kubernetes to automatically restart the container to recover from the failure.
NEW QUESTION # 210
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