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| Section | Weight | Objectives |
|---|---|---|
| Network Observability | 10% | - Hubble UI and troubleshooting basics - Hubble architecture and CLI usage - Layer 7 visibility and flow monitoring |
| Installation and Configuration | 10% | - Deployment methods (Helm, cilium-cli) - Post-install validation and connectivity testing |
| eBPF | 10% | - eBPF-based networking, security, and observability - eBPF fundamentals and relevance to Cilium |
| Cluster Mesh | 10% | - Multi-cluster connectivity and service discovery - Cross-cluster load balancing and failover |
| Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
| Network Policy | 18% | - Identity-aware and L3–L7 policy models - Policy enforcement modes - Cilium vs Kubernetes network policies |
| Service Mesh | 16% | - Sidecar vs sidecarless architecture - Transparent traffic encryption - Ingress and Gateway API integration |
| BGP and External Networking | 6% | - External gateway integration - BGP peering and service advertisement |
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NEW QUESTION # 29
Among the definitions provided for the entities host, remote-node, cluster, and all, which description is accurate in the context of Cilium network policy?
Answer: C
Explanation:
Technical explanation
The host entity represents the local node on which the selected Cilium endpoint resides. It also includes processes and containers using the local host network namespace. Therefore, A reproduces the official entity definition accurately.
The remote-node entity does not represent arbitrary unmanaged endpoints. It represents hosts other than the local node across the local cluster and connected clusters, including host-networked containers on those nodes. Unmanaged endpoints instead have the reserved unmanaged identity.
Option C gives the definition of the separate kube-apiserver entity, not cluster . The cluster entity is the logical collection of endpoints and reserved identities inside the local cluster, including Cilium-managed endpoints, unmanaged local endpoints, hosts, remote nodes, health, ingress, initialization, and kube-apiserver identities. Current documentation separately provides a cluster-mesh entity for endpoints in connected clusters.
Option D confuses all with world . world represents endpoints outside the cluster. all covers all identities and is not simply equivalent to the IPv4 CIDR 0.0.0.0/0 , particularly in identity-aware, node, and IPv6 contexts.
Official references
Cilium Layer 3 Policy Entities , Cilium Reserved Identities
Study Guide topic: Reserved entities and identity-based Layer 3 policies.
NEW QUESTION # 30
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 # 31
Which Cilium command should you execute to gather network-related troubleshooting information from your Kubernetes cluster?
Answer: C
Explanation:
Technical explanation
The intended answer is D, but the option contains a source-bank typographical error. The valid command is cilium sysdump , not cilium sysduwp . Read literally, none of the four displayed commands exactly answers the question.
The Cilium CLI's sysdump operation gathers cluster-wide troubleshooting material, including Cilium configuration and endpoint state, agent and operator logs, Kubernetes workload information, routing and interface details, kernel messages, service state, policies, and selected eBPF-map output. This consolidated archive is the preferred diagnostic package when investigating Kubernetes networking or preparing a support report.
cilium status --verbose provides expanded health and deployment status, but it does not collect the comprehensive diagnostic archive requested. debuginfo is associated with the in-agent debug client- currently documented as cilium-dbg debuginfo -and produces useful local-agent API information; in Kubernetes environments it is already included as part of the system dump. cilium bugtool is not the current cluster-wide Cilium CLI command requested here.
For an exam-ready correction, option D should read cilium sysdump .
Official references
Cilium Troubleshooting and Sysdump
Study Guide topic: Cilium CLI troubleshooting, system dumps, and diagnostic collection.
NEW QUESTION # 32
What is true about Layer 7 protocol visibility in Cilium?
Answer: B
Explanation:
Technical explanation
Layer 7 protocol visibility redirects traffic matching the relevant L7 rules to Cilium's node-local proxy, which is Envoy. Envoy parses supported application protocols and supplies the resulting request or response metadata to Cilium's observability pipeline. Therefore, C correctly identifies the architectural consequence of enabling this visibility.
The feature requires L7 proxy support and an appropriate CiliumNetworkPolicy containing Layer 7 rules. A standard Kubernetes NetworkPolicy is limited to Layer 3 and Layer 4 concepts and cannot express Cilium's HTTP, DNS, or generic application-protocol rules, so B is incorrect.
A is also incorrect. DNS policy and visibility are commonly applied to pod egress queries, and Cilium's model is not restricted to ingress-only DNS visibility. D overstates protocol coverage. Cilium supports defined L7 parsers and policy types-most prominently HTTP, DNS, Kafka, and supported generic Envoy- based protocols-but it does not promise arbitrary visibility for every application protocol. SSH, Telnet, and FTP cannot simply be assumed to receive native semantic parsing.
An operational caveat is that L7 visibility rules also affect policy enforcement: they are not merely passive packet logging instructions.
Official references
Layer 7 Protocol Visibility , Cilium Envoy
Study Guide topic: L7 proxy redirection, CiliumNetworkPolicy, protocol parsing, and Hubble visibility.
NEW QUESTION # 33
Which of these observability features is NOT supported by Hubble?
Answer: B
Explanation:
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.
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