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| Section | Weight | Objectives |
|---|---|---|
| Network Observability | 10% | - Understand the Observability Capabilities of Hubble
|
| Cluster Mesh | 10% | - Understand the Benefits of Cluster Mesh for Multi-cluster Connectivity
|
| BGP and External Networking | 6% | - Egress Connectivity Requirements
|
| Architecture | 20% | - Understand the Role of Cilium in Kubernetes Environments
|
| eBPF | 10% | - Understand the Role of eBPF in Cilium
|
| Network Policy | 18% | - Interpret Cilium Network Policies and Intent
|
| Service Mesh | 16% | - Know How to use Ingress or Gateway API for Ingress Routing
|
| Installation and Configuration | 10% | - Know How to Use Cilium CLI to Query and Modify the Configuration
|
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質問 # 56
You want to consult the current Cilium configuration using the Cilium CLI. Which command should you use?
正解：A
解説：
Technical explanation
cilium config view is the Cilium CLI command intended to display the current configuration. It reads the configuration associated with the selected Kubernetes context, Cilium namespace, and Helm release and presents the relevant settings for inspection. This makes D the direct answer.
cilium status performs a different function. It reports the health and readiness of Cilium components such as the agent DaemonSet, operator, Envoy, Hubble Relay, and Cluster Mesh. Although status output may reveal a small amount of deployment information, it is not a complete configuration-viewing command.
cilium sysdump collects a comprehensive troubleshooting archive containing Kubernetes resources, component logs, command output, configuration data, and other diagnostic evidence. It is appropriate when preparing a support bundle, but it is unnecessarily broad for simply consulting the current configuration.
cilium context deals with Kubernetes context selection or inspection rather than displaying Cilium's configured values.
The Cilium CLI organizes configuration operations under the cilium config command group. Related subcommands include set , delete , and view . Because the requested action is read-only inspection of the existing settings, view is the appropriate subcommand.
Official references
Cilium CLI `config view` .
Study Guide topic: Installation and Configuration.
質問 # 57
Which proxy does Cilium use to enforce HTTP and other Layer 7 (L7) policies specified in network policies for the cluster?
正解：A
解説：
Technical explanation
Cilium uses Envoy as its userspace Layer 7 proxy. When a Cilium policy contains HTTP or another supported application-layer rule, Cilium's eBPF datapath identifies matching traffic and redirects it to a node-local Envoy instance. Envoy evaluates the application-layer attributes-such as HTTP method, path, or headers- against the generated policy configuration and then forwards or rejects the request.
The proxy can operate in embedded mode as a separate process inside the Cilium agent pod or as the independently life-cycled cilium-envoy DaemonSet. Both deployment forms use Cilium's optimized Envoy distribution and custom policy-enforcement filters. Communication between the agent and Envoy uses local UNIX-domain sockets for configuration, access logs, and administrative operations.
HAProxy is a capable general-purpose load balancer, but it is not Cilium's L7 policy proxy. Squid primarily serves forward and caching proxy use cases. linkerd2-proxy belongs to the Linkerd service mesh and is not used by Cilium for network-policy enforcement. Consequently, only D identifies the proxy integrated into Cilium's L7 datapath.
Official references
Cilium Envoy , Cilium eBPF Datapath Introduction
Study Guide topic: Envoy proxy integration and Layer 7 policy enforcement.
質問 # 58
a requirement to achieve service discovery and load balancing across clusters with Cluster Mesh?
正解：C
解説：
Technical explanation
Every cluster participating in a Cilium Cluster Mesh must have a unique cluster name and numeric cluster ID.
The numeric ID becomes part of Cluster Mesh security identities and allows Cilium to distinguish identities originating in different clusters. Reusing an ID would create ambiguity in endpoint identity, policy enforcement, and synchronized service information. Current documentation permits IDs from 1 through 255 under the default scaling configuration.
Geographical colocation is not required. Cluster Mesh is specifically designed to extend connectivity, policy, service discovery, and load balancing across clusters that may reside in different regions, clouds, or premises, provided the documented network-connectivity requirements are satisfied. The clusters also do not need to use an identical Kubernetes distribution or exact Kubernetes version.
Option C is unnecessarily strict. Current Cilium documentation permits connected clusters to differ by no more than one minor Cilium release; exact version equality is not mandatory. Other prerequisites include unique and non-conflicting PodCIDRs, compatible datapath modes, node connectivity, and appropriate inter- cluster communication.
The supplied bank incorrectly marks A. The verified answer is D.
Official references
Setting up Cluster Mesh .
Study Guide topic: Cluster Mesh.
質問 # 59
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：D
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 # 60
What is an accurate description related to eBPF?
正解：A
解説：
Technical explanation
D is the accurate general description because eBPF programs can attach at kernel and application-related hook points where data may already be decrypted, depending on the program and the selected hook. The statement says "could," not that every packet-processing eBPF program automatically decrypts TLS. Cilium's documented TLS-aware inspection uses controlled TLS termination and a userspace Envoy proxy; the broader point is that eBPF is not restricted to observing encrypted wire-format packets at a single network interface.
The other choices are directly contradicted by Cilium's eBPF documentation. XDP and traffic-control programs can be replaced atomically at runtime without rebooting the host or restarting network services, so A is false. Traffic-control BPF supports both ingress and egress hook points, making B false. Cilium also applies eBPF-based security to the host through its Host Firewall and host-policy capabilities; therefore, eBPF security is not inherently confined to container traffic, and C is false.
A critical distinction is that inspecting application plaintext depends on where the program attaches and where encryption occurs. Cilium's ordinary L3/L4 datapath does not magically decrypt TLS, while its documented TLS interception workflow explicitly terminates and re-originates selected connections to expose application- layer content.
Official references
Cilium eBPF program types ; eBPF datapath introduction ; Inspecting TLS Encrypted Connections .
Study Guide topic: eBPF.
質問 # 61
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