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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: BGP and External Networking | 6% | - BGP peering and service advertisement - External gateway integration |
| Topic 2: Cluster Mesh | 10% | - Multi-cluster connectivity and service discovery - Cross-cluster load balancing and failover |
| Topic 3: Network Observability | 10% | - Layer 7 visibility and flow monitoring - Hubble UI and troubleshooting basics - Hubble architecture and CLI usage |
| Topic 4: Service Mesh | 16% | - Sidecar vs sidecarless architecture - Transparent traffic encryption - Ingress and Gateway API integration |
| Topic 5: eBPF | 10% | - eBPF fundamentals and relevance to Cilium - eBPF-based networking, security, and observability |
| Topic 6: Architecture | 20% | - CNI integration and kube-proxy replacement - Cilium core architecture and components |
| Topic 7: Network Policy | 18% | - Policy enforcement modes - Cilium vs Kubernetes network policies - Identity-aware and L3–L7 policy models |
| Topic 8: Installation and Configuration | 10% | - Deployment methods (Helm, cilium-cli) - Post-install validation and connectivity testing |
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NEW QUESTION # 17
Which of these is true of Cilium Cluster Mesh and Network Policies?
Answer: A
Explanation:
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.
NEW QUESTION # 18
You want to consult the current Cilium configuration using the Cilium CLI. Which command should you use?
Answer: A
Explanation:
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.
NEW QUESTION # 19
What is an accurate description related to eBPF?
Answer: B
Explanation:
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.
NEW QUESTION # 20
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 # 21
What is a correct statement related to BIG TCP, an eBPF-based feature in Cilium?
Answer: B
Explanation:
Technical explanation
BIG TCP permits the Linux networking stack to process packets larger than the traditional approximately 64- KiB limit represented by the IP length field while the packets remain inside the host. IPv6 BIG TCP uses a temporary Hop-by-Hop header carrying the larger internal length, while IPv4 BIG TCP sets tot_len to zero and uses the socket buffer length internally. Before transmission, packets are segmented into sizes suitable for the physical network. C therefore identifies the problem BIG TCP addresses.
Option A is false because Cilium's documentation explicitly states that BIG TCP does not require network- interface MTU changes. The larger objects exist inside the software networking stack and are segmented before appearing on the wire.
Option B reverses the intended performance effect. Larger internal GSO and GRO packets reduce repeated stack traversal, lowering CPU utilization and generally improving throughput and latency. Option D is also false: Generic Segmentation Offload and Generic Receive Offload are fundamental to BIG TCP's operation.
Cilium increases their maximum sizes when BIG TCP is enabled. The source mentions TSO, but the documented mechanism is principally described through GSO and GRO.
Official references
Cilium Performance Tuning and BIG TCP
Study Guide topic: BIG TCP, GSO/GRO, packet-length limits, and performance.
NEW QUESTION # 22
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