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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
| Topic 2: eBPF | 10% | - eBPF-based networking, security, and observability - eBPF fundamentals and relevance to Cilium |
| Topic 3: Cluster Mesh | 10% | - Multi-cluster connectivity and service discovery - Cross-cluster load balancing and failover |
| Topic 4: Network Policy | 18% | - Identity-aware and L3–L7 policy models - Policy enforcement modes - Cilium vs Kubernetes network policies |
| Topic 5: Service Mesh | 16% | - Ingress and Gateway API integration - Sidecar vs sidecarless architecture - Transparent traffic encryption |
| Topic 6: Network Observability | 10% | - Hubble UI and troubleshooting basics - Layer 7 visibility and flow monitoring - Hubble architecture and CLI usage |
| Topic 7: Installation and Configuration | 10% | - Post-install validation and connectivity testing - Deployment methods (Helm, cilium-cli) |
| Topic 8: BGP and External Networking | 6% | - External gateway integration - BGP peering and service advertisement |
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NEW QUESTION # 16
Which statement is true of both the Ingress Controller and Gateway API?
Answer: D
Explanation:
Technical explanation
Both Kubernetes Ingress and the north-south use of Gateway API provide declarative Layer 7 routing from clients outside the cluster to Kubernetes workloads. They express host- and path-based routing through Kubernetes resources and can be implemented by controllers such as Cilium's Envoy-based ingress implementation. A therefore captures their shared purpose most accurately.
The remaining choices describe differences rather than universal similarities. Gateway API is explicitly role- oriented: infrastructure administrators manage GatewayClass and often Gateway , while application owners manage route resources such as HTTPRoute . The Ingress API does not provide the same formal separation of administrative and application-facing resources, making C unsuitable as a statement about both.
Implementation-specific annotations are historically common with Ingress because its core API is limited.
Gateway API was deliberately designed with more expressive, portable resource fields so that implementations do not need to depend as heavily on vendor-specific annotations; D is consequently not true of both. Namespace behavior also differs because Gateway API provides controlled cross-namespace attachment and reference mechanisms. B is therefore not the defining common capability.
Official references
Cilium Kubernetes Ingress Support , Cilium Gateway API Support , Migrating from Ingress to Gateway API Study Guide topic: Kubernetes north-south routing, Ingress, and Gateway API.
NEW QUESTION # 17
You need to expose an application over HTTPS on your Cilium-managed Kubernetes cluster The security team has specifically asked for traffic to be encrypted all the way from the external clients to the Service.
Which option should you use?
Answer: D
Explanation:
Technical explanation
The requirement is that traffic remain encrypted all the way from the external client to the backend Service .
Therefore, TLS must not terminate at the Cilium Gateway/Envoy proxy .
With TLS Passthrough , Cilium forwards the encrypted TLS stream to the backend without decrypting the application traffic. Envoy can inspect the TLS ClientHello/SNI sufficiently to select the appropriate backend, but the TLS session itself continues to the Service. Cilium specifically supports TLS passthrough with the Gateway API TLSRoute resource .
By contrast, TLS Terminate + HTTPRoute decrypts the connection at the Gateway. Although a separate encrypted connection to the backend can be configured in some architectures, that is not the same as preserving the original end-to-end TLS session requested here. Cilium's HTTPS Gateway examples use TLS termination when the Gateway itself handles the certificate.
Study Guide topic: Service Mesh.
NEW QUESTION # 18
The application team would like to observe egress traffic with application level information for workloads running in a Cilium based Kubernetes Cluster Which features would offer this without the need for additional tooling?
Answer: A
Explanation:
Technical explanation
Hubble UI and Hubble CLI are Cilium's integrated interfaces for examining workload network flows. Hubble records source and destination identities, namespaces, workloads, addresses, ports, forwarding verdicts, and drop reasons. When Layer 7 visibility is configured, its flow output can also contain application-level information such as HTTP methods, URLs, response codes, latency, and DNS queries. Filters can narrow the results by source workload, namespace, destination, protocol, port, or verdict, making Hubble appropriate for investigating egress behavior.
Hubble CLI provides detailed event-oriented inspection, while Hubble UI presents flows and service dependencies graphically. Hubble Relay aggregates the per-node Hubble APIs so these clients can obtain cluster-wide visibility.
Load balancing directs traffic but is not an observability interface. Kubernetes NetworkPolicy expresses permitted communications but does not by itself display application-level flow records. Fluentd and Grafana are external logging and visualization components and would violate the requirement to avoid additional tooling.
Layer 7 information requires supported traffic to be redirected through Cilium's L7 proxy. Hubble then exposes the resulting application-layer flow events through the built-in CLI or UI, making D the complete answer.
Official references
Network Observability with Hubble ; Inspecting Network Flows .
Study Guide topic: Network Observability.
NEW QUESTION # 19
Which component is embedded in the Cilium Agent and retrieves eBPF-based visibility from Cilium?
Answer: C
Explanation:
Technical explanation
The Hubble Server is embedded in each Cilium agent and consumes the eBPF-derived visibility data produced on that node. It exposes gRPC services through which clients can retrieve flow events, node and namespace information, server status, and related observability data. Embedding the server in the agent enables high-performance collection with comparatively low overhead.
Hubble Relay has a different role. It is a standalone component that discovers and connects to the Hubble Server instances running across the cluster. Relay aggregates their individual APIs to provide multi-node or cluster-wide visibility to clients such as the Hubble CLI and Hubble UI. It is therefore not the component embedded in the agent.
The Cilium CNI plugin is invoked when Kubernetes creates or removes pods and asks the local agent to configure their networking and datapath. The Cilium Operator performs cluster-wide management duties such as selected IPAM and shared-state operations. Neither component is responsible for exposing eBPF flow visibility.
This server-relay distinction is central to understanding Hubble's distributed architecture: Server provides node-local visibility, while Relay combines multiple servers into a cluster-wide view.
Official references
Hubble Internals , Cilium Component Overview
Study Guide topic: Hubble Server, Hubble Relay, and distributed flow observability.
NEW QUESTION # 20
Which one of the following commands will correctly display show the Cilium configuration?
Answer: A
Explanation:
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.
NEW QUESTION # 21
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