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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Policy | 18% | - Identity-aware and L3–L7 policy models - Cilium vs Kubernetes network policies - Policy enforcement modes |
| Topic 2: Architecture | 20% | - CNI integration and kube-proxy replacement - Cilium core architecture and components |
| Topic 3: Service Mesh | 16% | - Ingress and Gateway API integration - Transparent traffic encryption - Sidecar vs sidecarless architecture |
| Topic 4: Network Observability | 10% | - Hubble architecture and CLI usage - Layer 7 visibility and flow monitoring - Hubble UI and troubleshooting basics |
| Topic 5: BGP and External Networking | 6% | - BGP peering and service advertisement - External gateway integration |
| Topic 6: Installation and Configuration | 10% | - Post-install validation and connectivity testing - Deployment methods (Helm, cilium-cli) |
| Topic 7: eBPF | 10% | - eBPF-based networking, security, and observability - eBPF fundamentals and relevance to Cilium |
| Topic 8: Cluster Mesh | 10% | - Multi-cluster connectivity and service discovery - Cross-cluster load balancing and failover |
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NEW QUESTION # 40
Which component, when available, is able to handle IPAM requests?
Answer: B
Explanation:
Technical explanation
The Cilium Operator handles IP address management responsibilities in IPAM modes that require cluster- wide or cloud-integrated allocation. Current documentation identifies the operator as responsible for IPAM in Azure IPAM, AWS ENI, and cluster-scope mode. Cloud-specific operators populate the appropriate allocation information in CiliumNode resources, after which node-local agents allocate addresses to endpoints from the available ranges.
The phrase "when available" is important because responsibilities vary by IPAM mode. Under Kubernetes host-scope IPAM, Kubernetes allocates each node's PodCIDR, and the Cilium agent consumes that range from the Kubernetes Node object. Nevertheless, among the supplied components, the operator is the component specifically associated with centralized IPAM requests and allocation management.
The Cilium agent implements each node's datapath and endpoint lifecycle but is not the general cluster-wide IPAM answer intended here. Cilium API Server is not the documented allocation component. The misspelled Cilium CNIPIugin refers to the CNI plugin, which requests networking setup when a pod is created but does not replace the operator's IPAM responsibilities.
Official references
Cilium Operator , Cilium IP Address Management
Study Guide topic: Cilium Operator responsibilities and IPAM modes.
NEW QUESTION # 41
Which encapsulation protocols are supported when configuring Cilium in tunnel mode?
Answer: D
Explanation:
Technical explanation
Cilium tunnel mode supports VXLAN and Geneve encapsulation. In this routing model, Cilium nodes form an overlay mesh, and traffic exchanged between nodes is carried inside UDP-encapsulated packets. VXLAN is the default tunnel protocol and normally uses UDP port 8472. Geneve is the alternative and normally uses UDP port 6081. Operators select the protocol through the tunnel-protocol configuration setting, whose documented values are vxlan and geneve .
Encapsulation reduces the requirements placed on the underlying network. The underlay only needs to provide IP connectivity between the Kubernetes nodes and permit the selected UDP tunnel port. It does not need to learn or route individual PodCIDRs. Cilium also uses the tunnel metadata to carry information such as the source security identity, avoiding an additional identity lookup on the receiving node.
MPLS, OTV, STT, and EVPN are not supported values for Cilium's tunnel-protocol setting. EVPN may be used in broader data-center network designs, and MPLS is a carrier-routing technology, but neither is a Cilium overlay encapsulation choice. Therefore, B is the only supported pair.
Official references
Cilium Routing ; System Requirements .
Study Guide topic: Architecture.
NEW QUESTION # 42
You must add Hubble to your Kubernetes cluster where Cilium is NOT the installed CNI. Your cluster is already running in production and you must minimise downtime.
Which method is the most appropriate?
Answer: A
Explanation:
Technical explanation
Hubble obtains its visibility from Cilium's eBPF datapath, and the Hubble Server is embedded in the Cilium agent. Hubble therefore cannot provide its normal flow-observability capabilities as a standalone installation without Cilium, eliminating B.
CNI chaining allows Cilium to coexist with a supported existing CNI. The original plugin continues to supply base connectivity and IP address management, while Cilium attaches eBPF programs to the created network devices. Those programs provide visibility, policy enforcement, and other Cilium functionality. Hubble can then be enabled on top of the chained Cilium deployment. This approach avoids an immediate, disruptive replacement of the production cluster's networking layer and is consequently the best answer.
Options C and D could be appropriate in broader migration projects, particularly when a current CNI is incompatible with chaining or when full native-Cilium functionality is required. However, both imply substantially more workload movement or cutover activity than the stated objective of minimizing downtime.
Compatibility, chaining mode, current CNI behavior, kernel requirements, and feature limitations must still be validated before production rollout.
Official references
Cilium CNI Chaining , Hubble Internals , Troubleshooting Hubble
Study Guide topic: Hubble prerequisites, CNI chaining, and production adoption.
NEW QUESTION # 43
Which of the following best describes how eBPF is used within Cilium9
Answer: D
Explanation:
Technical explanation
D most precisely describes Cilium's foundational use of eBPF. The Cilium agent translates desired networking and security state into eBPF programs and maps, then attaches those programs to Linux kernel hook points such as traffic-control ingress and egress, XDP, cgroups, and sockets. Packets can consequently be classified, permitted, dropped, redirected, load-balanced, or forwarded without requiring changes to the protected application.
Endpoint-policy programs associate traffic with Cilium security identities and perform Layer 3 and Layer 4 enforcement in the kernel. Traffic requiring Layer 7 inspection can be redirected from the eBPF datapath to Envoy. This combination provides efficient kernel-level enforcement while retaining application-aware controls.
Option A describes an important Hubble observability outcome, but it is narrower than Cilium's primary networking and enforcement model and overstates what is necessarily exposed through a UI. Option B mischaracterizes Cilium as DNS infrastructure; Cilium can enforce DNS-aware policies but does not replace Kubernetes DNS service discovery. Option C is too generic and implies a conventional threat-detection product rather than identity-based networking and policy enforcement.
Official references
Cilium eBPF Datapath Introduction , Introduction to Cilium and Hubble
Study Guide topic: Kernel hooks, endpoint policy, identities, and eBPF datapath enforcement.
NEW QUESTION # 44
When considering changing an existing cluster's IPAM (IP address management) mode, what is the safest path?
Answer: D
Explanation:
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.
NEW QUESTION # 45
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