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| Section | Weight | Objectives |
|---|---|---|
| Installation and Configuration | 10% | - Post-install validation and connectivity testing - Deployment methods (Helm, cilium-cli) |
| Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
| eBPF | 10% | - eBPF fundamentals and relevance to Cilium - eBPF-based networking, security, and observability |
| BGP and External Networking | 6% | - External gateway integration - BGP peering and service advertisement |
| 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 |
| Network Observability | 10% | - Hubble architecture and CLI usage - Layer 7 visibility and flow monitoring - Hubble UI and troubleshooting basics |
| Cluster Mesh | 10% | - Cross-cluster load balancing and failover - Multi-cluster connectivity and service discovery |
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質問 # 28
Which command is used to enable logging at the debug log level of Cilium agents7
正解：C
解説：
Technical explanation
cilium config set debug true follows the supported Cilium CLI configuration syntax and sets the debug configuration key to true . The cilium config set command accepts a key/value pair and, by default, restarts the Cilium pods so that the changed configuration is applied. The Cilium configuration documentation defines debug as the setting that enables full debug mode. This increases agent logging verbosity and causes eBPF programs to emit additional visibility events for diagnostic use.
Options A, B, and D do not match documented Cilium CLI command structures. There is no cilium log level
--set=debug command in the Cilium CLI hierarchy, and neither cilium logging.level=debug nor cilium logging debug is valid configuration syntax. A Helm-managed installation may also enable debugging through the chart value debug.enabled=true , but that does not make any of the alternative commands correct.
Debug mode should be enabled deliberately because it increases log volume and may generate additional datapath visibility information. After troubleshooting, operators should normally restore the previous setting to avoid unnecessary operational overhead.
The supplied answer key incorrectly identifies B. The verified answer is C.
Official references
Cilium configuration ; Cilium CLI `config set` ; Helm values .
Study Guide topic: Installation and Configuration.
質問 # 29
Which of these is true of Cilium Cluster Mesh and Network Policies?
正解：C
解説：
Technical explanation
Cluster Mesh extends Cilium's identity-aware networking and policy enforcement across connected Kubernetes clusters. A CiliumNetworkPolicy can authorize communication with workloads in a particular remote cluster by selecting their workload labels together with the synthetic io.cilium.k8s.policy.cluster label.
Therefore, A accurately describes a direct network-policy function.
The policies themselves are not automatically copied between clusters. Administrators remain responsible for applying the required policy resources in the appropriate clusters, but enforcement can select and govern remote endpoints once Cluster Mesh has propagated their identities.
Option B confuses authorization with transport encryption. WireGuard or IPsec configuration enables transparent encryption; it is not established by a network-policy rule. Option C is also separate from policy enforcement: cross-cluster load balancing is configured through global-service facilities and service annotations, not through CiliumNetworkPolicy . Option D is incorrect under current documentation because Cilium mutual authentication does not provide a single trust domain spanning Cluster Mesh clusters and is not presently compatible with that multi-cluster arrangement.
Official references
Cluster Mesh Network Policy , Cluster Mesh Services , Mutual Authentication Limitations Study Guide topic: Cross-cluster identity, endpoint selection, and policy enforcement.
質問 # 30
What are the differences between Ingress and Gateway API?
正解：C
解説：
Technical explanation
Ingress provides a comparatively simple API for exposing HTTP and HTTPS applications through host- and path-based routing. Gateway API is a broader, extensible family of resources that separates infrastructure configuration from application routing. Resources such as GatewayClass , Gateway , HTTPRoute , GRPCRoute , TLSRoute , TCPRoute , and UDPRoute model listeners, routes, protocols, ownership, and attachment relationships explicitly.
Gateway API was designed around operational roles. An infrastructure provider can manage the GatewayClass , a cluster operator can provision a Gateway , and an application team can own a route attached to that Gateway. This offers clearer delegation than the single Ingress resource and supports protocols and traffic-management functions beyond the original Ingress model.
The two APIs are not simply different names for identical functionality, so A is false. Option C is also inaccurate because Cilium's implementations of both Ingress and Gateway API integrate with its eBPF datapath and Envoy; Ingress is not inherently an iptables-only implementation. Option D incorrectly limits Gateway API to internal routing. It can expose internet-facing applications through generated LoadBalancer or NodePort Services or through host-network listeners.
Official references
Migrating from Ingress to Gateway ; Gateway API Support .
Study Guide topic: Service Mesh.
質問 # 31
Which Cilium command should you execute to gather network-related troubleshooting information from your Kubernetes cluster?
正解：A
解説：
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.
質問 # 32
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?
正解：A
解説：
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.
質問 # 33
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