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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: BGP and External Networking | 6% | - BGP peering and service advertisement - External gateway integration |
| Topic 2: Network Observability | 10% | - Hubble architecture and CLI usage - Hubble UI and troubleshooting basics - Layer 7 visibility and flow monitoring |
| Topic 3: Installation and Configuration | 10% | - Deployment methods (Helm, cilium-cli) - Post-install validation and connectivity testing |
| Topic 4: Architecture | 20% | - CNI integration and kube-proxy replacement - Cilium core architecture and components |
| Topic 5: Service Mesh | 16% | - Transparent traffic encryption - Sidecar vs sidecarless architecture - Ingress and Gateway API integration |
| Topic 6: eBPF | 10% | - eBPF fundamentals and relevance to Cilium - eBPF-based networking, security, and observability |
| Topic 7: Cluster Mesh | 10% | - Cross-cluster load balancing and failover - Multi-cluster connectivity and service discovery |
| Topic 8: Network Policy | 18% | - Identity-aware and L3–L7 policy models - Cilium vs Kubernetes network policies - Policy enforcement modes |
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61. Frage
What is an accurate description related to eBPF?
Antwort: C
Begründung:
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.
62. Frage
Which proxy does Cilium use to enforce HTTP and other Layer 7 (L7) policies specified in network policies for the cluster?
Antwort: B
Begründung:
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.
63. Frage
How does Cilium primarily improve security in Kubernetes clusters?
Antwort: A
Begründung:
Technical explanation
Cilium primarily improves Kubernetes network security through identity-aware policy enforcement across Layers 3 through 7. Standard Kubernetes NetworkPolicy resources provide Layer 3 and Layer 4 controls, while CiliumNetworkPolicy extends enforcement to application-layer rules. Policies can select workloads by labels and identity, restrict protocols and destination ports, control communication with CIDRs or entities, apply DNS/FQDN rules, and authorize supported HTTP or gRPC operations. This multi-layer enforcement is the capability described by D.
API Gateway and Gateway API configurations can contribute to controlling north-south traffic, but they are not Cilium's primary or comprehensive security mechanism. Database encryption is implemented by database, storage, or encryption-management systems rather than being a general function of Cilium.
Persistent-volume backup is similarly outside Cilium's CNI, network-policy, and observability responsibilities.
Cilium's identity model is especially important in dynamic Kubernetes environments. Security policy follows workload identities derived from labels instead of depending exclusively on changing pod IP addresses. At Layer 7, traffic is redirected to Envoy when protocol-aware inspection or enforcement is required, while eBPF supplies the efficient kernel datapath for lower-layer processing.
Official references
Introduction to Cilium and Hubble ; Network Policy ; Layer 7 Policies .
Study Guide topic: Network Policy.
64. Frage
Please review the output of cilium status below and answer the question that follows. Please note, the output has been modified for accessibility purposes.
Question 2 cilium status exhibit
Assume the cluster is healthy. What is correct about the ci 1 ium status command output above?
Antwort: D
Begründung:
Technical explanation
The status output shows Envoy DaemonSet: disabled (using embedded mode) . In embedded mode, Cilium starts Envoy as a separate process inside the Cilium agent pod when a feature requiring Layer 7 processing- such as an L7 network policy, protocol visibility, Ingress, or Gateway API-is used. This is precisely the behavior described in option B.
The remaining choices contradict the exhibit. The Cilium DaemonSet has a desired count of three, which ordinarily indicates three schedulable nodes running Cilium, not four. Hubble Relay: OK means the aggregation component is healthy. Hubble Relay connects to the Hubble instances associated with Cilium agents and presents a multi-node API to clients such as Hubble CLI and Hubble UI. Finally, ClusterMesh:
disabled rules out the claim that the installation is currently configured for Cilium Cluster Mesh service discovery and cross-cluster load balancing.
Cilium can alternatively run Envoy through the independently life-cycled cilium-envoy DaemonSet. That is not the deployment displayed here because the DaemonSet is explicitly disabled and embedded mode is reported.
Official references
Envoy deployment modes ; Hubble internals .
Study Guide topic: Architecture.
65. Frage
When considering changing an existing cluster's IPAM (IP address management) mode, what is the safest path?
Antwort: D
Begründung:
Technical explanation
The official IPAM documentation expressly states that the safest way to change IPAM mode is to install a fresh Kubernetes cluster using the required new IPAM configuration. A live cluster already contains allocated workload addresses, node routing state, Cilium endpoint state, service state, and potentially cloud-provider resources that depend on the active allocator. Replacing the allocator in place can invalidate these assumptions and cause persistent connectivity disruption rather than merely a short agent restart.
Updating a Kubernetes Node object does not generally convert Cilium's IPAM mode. The responsible resource and allocation behavior depend on the selected mode: Kubernetes host-scope IPAM, cluster-pool IPAM, multi-pool IPAM, CRD-backed modes, and cloud-specific allocators manage address information differently. Restarting agents after changing a configuration value likewise does not constitute a safe migration plan, because existing endpoints and routes may retain state created under the former allocator.
Cilium advises against changing the IPAM mode of an existing cluster unless a specifically documented migration procedure applies. The currently documented exception is migration from cluster-pool IPAM to multi-pool IPAM. As the question provides no such constrained scenario, D is the unambiguously safest answer.
Official references
IP Address Management .
Study Guide topic: Installation and Configuration.
66. Frage
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