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| Section | Weight | Objectives |
|---|---|---|
| Architecture | 20% | - IP Address Management and Datapath Models - Cilium Architecture and Components |
| BGP and External Networking | 6% | - Egress Connectivity - Connecting Cilium Clusters to External Networks |
| Installation and Configuration | 10% | - Installation and Connectivity Testing - Cilium CLI and Configuration |
| Cluster Mesh | 10% | - Service Discovery and Load Balancing - Multi-Cluster Connectivity |
| Service Mesh | 16% | - Ingress and Gateway API - Traffic Encryption and Service Mesh Architectures |
| eBPF | 10% | - eBPF and iptables-Based Networking - eBPF Role and Benefits |
| Network Policy | 18% | - Identity-Based Network Security - Policy Rules and Enforcement |
| Network Observability | 10% | - Hubble and Layer 7 Visibility - Hubble CLI and UI |
>> Cilium-Associate Fragen Beantworten <<
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16. Frage
As a Kubernetes user, you have deployed the following Cilium Network Policy:
Cilium Layer 7 network policy exhibit
The network policy is not having any effect. What Is the Issue?
Antwort: A
Begründung:
Technical explanation
The policy attaches an HTTP Layer 7 rule to port 80 but omits protocol: TCP from the associated ports entry.
HTTP policy is layered on a Layer 4 TCP rule, and the documented Cilium form explicitly identifies TCP before specifying the HTTP method and path. D therefore identifies the configuration defect intended by the question.
The cross-namespace source selection is valid. The policy resides in namespace back and selects backend pods there. Its fromEndpoints selector explicitly includes k8s:io.kubernetes.pod.namespace: blog , allowing it to select matching app-frontend endpoints in that other namespace. Option A is consequently not an error.
The k8s: source prefix in k8s:app.kubernetes.io/name is also valid Cilium label syntax and identifies the Kubernetes label source, making B false. Port 80 may be used in a Cilium policy; the privileged-port restriction concerns which processes may bind low-numbered ports under operating-system permissions, not whether a network policy can reference them.
The corrected port entry should contain port: "80" together with protocol: TCP .
Official references
Cilium Layer 7 Policies , Kubernetes Constructs in Cilium Policy
Study Guide topic: Combining Layer 4 port rules with Layer 7 HTTP policies.
17. Frage
Which of these observability features is NOT supported by Hubble?
Antwort: B
Begründung:
Technical explanation
Hubble does not obtain Layer 7 protocol visibility exclusively through eBPF without a proxy. By default, Cilium's datapath exposes Layer 3 and Layer 4 flow information. To produce supported application-layer events, traffic is selected through an L7 Cilium policy and redirected to the node-local Envoy proxy. Envoy parses the application protocol and forwards access-log information that Cilium and Hubble expose as Layer
7 flow events.
The other capabilities are supported. Hubble flow records contain the observing node, and the CLI provides node-based filtering. HTTP-aware flows can contain response status codes, enabling inspection or filtering for results such as 200 and 404. Hubble also records forwarding verdicts and drop reasons. Operators can filter for DROPPED traffic and distinguish policy-denied connections from forwarded traffic and other failure conditions.
This separation is fundamental to Cilium's architecture: eBPF provides efficient kernel-level forwarding, security enforcement, and L3/L4 observability, while Envoy supplies protocol parsing when request-level context is required. The integration remains transparent to applications, but the proxy is still present in the traffic path for Layer 7 visibility.
Therefore, B describes the unsupported mechanism and is the correct answer.
Official references
Layer 7 Protocol Visibility ; Envoy ; Hubble CLI .
Study Guide topic: Network Observability.
18. Frage
Which one of the following service mesh features and use cases is natively supported by Cilium?
Antwort: A
Begründung:
Technical explanation
The intended answer is A because API request limiting corresponds to rate limiting, which Cilium identifies as a core Layer 7 traffic-management capability. Cilium combines its eBPF datapath with Envoy for application-layer processing. The official Service Mesh documentation expressly includes rate limiting among the functions that must understand protocols such as HTTP, REST, gRPC, and WebSocket. It is therefore not merely packet-rate policing at Layer 3 or Layer 4; it can be applied with application-protocol context.
However, this question is no longer valid as a strict single-answer item. Current Cilium documentation also describes proxy-based Layer 7 load balancing as useful for gRPC and provides an Envoy-backed implementation for Kubernetes Services. Consequently, option C is also supportable under the current product documentation, although the feature is identified as beta. API authorization and fault-delay injection are not presented as equivalent first-class Cilium Service Mesh use cases in the cited feature overview.
For certification-bank purposes, retain A as the intended answer, but revise option C or qualify it to restore a unique correct choice.
Official references
Service Mesh ; Proxy Load Balancing for Kubernetes Services .
Study Guide topic: Service Mesh.
19. Frage
A user has set up a global service as a Kubernetes user with access to clusters in a Cilium Cluster Mesh. They notice that all traffic is going to remote backend pods. What is a possible explanation?
Antwort: B
Begründung:
Technical explanation
If a global Service has no healthy local endpoints matching its selector, every available backend can be remote. Cluster Mesh synchronizes remote service and endpoint information, allowing the local Cilium datapath to load-balance requests to backend pods in connected clusters. The absence of local endpoints therefore provides a direct explanation for the observed behavior.
If the local cluster were not part of the Cluster Mesh, its Cilium agents would not normally receive the remote endpoint state needed to route traffic through the global Service, so B does not explain successful remote-only selection. An affinity value of none is the default behavior and expresses no preference between local and remote endpoints. When both categories exist and are healthy, this permits load balancing across both; it does not require every connection to use remote backends.
Setting service.cilium.io/shared: "false" prevents the local Service's backends from being shared with remote clusters. It does not instruct the local cluster to direct all requests toward remote endpoints.
A separate possible cause, not presented among the choices, would be service.cilium.io/affinity: "remote" .
Among the supplied answers, however, A is the valid explanation.
Official references
Service Affinity ; Cluster Mesh .
Study Guide topic: Cluster Mesh.
20. Frage
Which one of the following commands will correctly display show the Cilium configuration?
Antwort: D
Begründung:
Technical explanation
cilium config view is the Cilium CLI command used to display the current Cilium configuration. It reads the configuration associated with the selected Kubernetes context, Cilium namespace, and Helm release. The command belongs to the cilium config command group, which manages installation configuration.
Option B reverses the expected command structure and does not correspond to a documented Cilium CLI operation. Option D resembles command syntax used on traditional network appliances but is not part of the Cilium CLI. Option C is both textually corrupted and conceptually inaccurate: Cilium configuration is not generally exposed through a cluster-wide resource named ciliumconfig.cilium.io . Runtime settings are commonly represented through the Cilium ConfigMap and Helm release values, while specialized resources such as CiliumNodeConfig apply targeted per-node configuration.
The wording "display show" is a source-bank editing defect but does not affect the answer. Administrators should also distinguish the external cilium management CLI from cilium-dbg , which runs with or communicates with the node-local Cilium agent and provides detailed datapath and agent diagnostics.
Official references
cilium config view , Cilium Component Overview
Study Guide topic: Cilium CLI configuration inspection and command structure.
21. Frage
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