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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Installation and Configuration | 10% | - Deployment methods (Helm, cilium-cli) - Post-install validation and connectivity testing |
| Topic 2: BGP and External Networking | 6% | - External gateway integration - BGP peering and service advertisement |
| Topic 3: Cluster Mesh | 10% | - Cross-cluster load balancing and failover - Multi-cluster connectivity and service discovery |
| Topic 4: Service Mesh | 16% | - Transparent traffic encryption - Ingress and Gateway API integration - Sidecar vs sidecarless architecture |
| Topic 5: eBPF | 10% | - eBPF fundamentals and relevance to Cilium - eBPF-based networking, security, and observability |
| Topic 6: Network Policy | 18% | - Identity-aware and L3–L7 policy models - Cilium vs Kubernetes network policies - Policy enforcement modes |
| Topic 7: Architecture | 20% | - CNI integration and kube-proxy replacement - Cilium core architecture and components |
| Topic 8: Network Observability | 10% | - Hubble architecture and CLI usage - Hubble UI and troubleshooting basics - Layer 7 visibility and flow monitoring |
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NEW QUESTION # 54
You are managing two Kubernetes clusters, labeled as Cluster A and Cluster B, both of which have Cilium installed. You want to mesh Cluster A and Cluster B together The following characteristics define these clusters:
# Both clusters are configured In encapsulation mode.
# The PodCIDR ranges differ: Cluster A uses 192.168.0.0723, while Cluster B uses 192.168.2.0/24.
# There is IP connectivity between the nodes in all clusters using their respective InternallP addresses.
# The network infrastructure between the clusters enables inter-cluster communication.
# Cluster A runs Kubernetes version 1.28, and Cluster B runs Kubernetes version 1.27.
# Cilium versions also differ, with Cluster A using version 1.14 and Cluster B using version 1.13.
# Both clusters share the same cluster name and cluster ID.
# The Cilium certificate authority differs between Cluster A and Cluster B.
Is it possible to create a cluster mesh given the conditions?
Answer: D
Explanation:
Technical explanation
A Cluster Mesh can be created after assigning each cluster a unique name and numeric cluster ID. Cilium uses the cluster ID when constructing Cluster Mesh security identities, so duplicate values cannot safely identify endpoints from different clusters. The name must likewise be unique. These values can be changed after installation, although all existing workloads must then be restarted so their security identities are regenerated.
The other listed conditions are compatible. Both clusters use the same encapsulation datapath mode, their PodCIDRs are intended to be non-overlapping, and the nodes possess the required inter-cluster connectivity.
Different Kubernetes patch or minor versions do not inherently prevent Cluster Mesh. Cilium versions may differ by one minor release, so versions 1.14 and 1.13 satisfy the documented compatibility rule.
Different certificate authorities are not an irreversible blocker under current documentation. Every cluster must trust certificates presented by the others. Operators may use a shared root CA or configure a CA bundle containing all trusted CA certificates. Consequently, B is too absolute. C is also false because changing the cluster identity is possible, subject to workload restarts. D is unnecessary because a one-minor Cilium difference is supported.
The source's option A is truncated, but its intended corrective action is technically accurate.
Official references
Setting up Cluster Mesh .
Study Guide topic: Cluster Mesh.
NEW QUESTION # 55
What is an accurate description related to eBPF?
Answer: C
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 # 56
Which component, when available, is able to handle IPAM requests?
Answer: D
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 # 57
Which of the following best describes how eBPF is used within Cilium9
Answer: A
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 # 58
When using Cilium with the kube-proxy replacement enabled, which underlying technology is effectively replaced with eBPF?
Answer: D
Explanation:
Technical explanation
Kubernetes kube-proxy conventionally implements Service translation and load balancing through either iptables or IPVS. With Cilium's kube-proxy replacement enabled, eBPF programs and maps perform Kubernetes Service handling directly in the kernel, including ClusterIP, NodePort, LoadBalancer, ExternalIP, and related service translation functions. C is therefore correct.
The replacement can operate at socket hooks and packet-processing hooks. Service and backend information is stored in eBPF maps, allowing the datapath to select backends and perform address translation without traversing the kube-proxy-generated iptables or IPVS rules normally used for Kubernetes Services.
BGP is not replaced. Cilium's BGP Control Plane is a separate feature used to advertise routes and service addresses to external routers. Routing itself is also not eliminated; Cilium can implement and accelerate routing decisions with eBPF, but packets still require a valid forwarding model. firewalld is a host firewall- management service and is not the underlying Kubernetes Service implementation replaced by kube-proxy replacement.
Relevant installations must satisfy the kernel and device requirements for Cilium's eBPF service load- balancer functionality.
Official references
Kubernetes Without kube-proxy
Study Guide topic: kube-proxy replacement, eBPF service maps, iptables, and IPVS.
NEW QUESTION # 59
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