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| Section | Weight | Objectives |
|---|---|---|
| BGP and External Networking | 6% | - BGP peering and service advertisement - External gateway integration |
| eBPF | 10% | - eBPF-based networking, security, and observability - eBPF fundamentals and relevance to Cilium |
| Network Policy | 18% | - Identity-aware and L3–L7 policy models - Cilium vs Kubernetes network policies - Policy enforcement modes |
| Installation and Configuration | 10% | - Deployment methods (Helm, cilium-cli) - Post-install validation and connectivity testing |
| Network Observability | 10% | - Hubble UI and troubleshooting basics - Hubble architecture and CLI usage - Layer 7 visibility and flow monitoring |
| Cluster Mesh | 10% | - Cross-cluster load balancing and failover - Multi-cluster connectivity and service discovery |
| Service Mesh | 16% | - Ingress and Gateway API integration - Sidecar vs sidecarless architecture - Transparent traffic encryption |
| Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
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NEW QUESTION # 25
Which component manages the allocation of per-node PodCIDRs in the cluster-scope IPAM (IP address management) mode?
Answer: D
Explanation:
Technical explanation
In cluster-scope IPAM, the Cilium Operator allocates a PodCIDR to each node from the configured cluster- wide address pool. It records those allocations in each node's CiliumNode custom resource, specifically under spec.ipam.podCIDRs . The Cilium agent waits for this allocation during startup and then performs host-local allocation of individual pod addresses from the CIDR assigned to its node.
This division of responsibility explains why C is correct. The agent consumes its assigned range and allocates endpoint addresses locally, but it does not independently choose the cluster-wide per-node PodCIDR. The Operator coordinates those ranges to prevent nodes from receiving overlapping allocations.
Options A and D describe Kubernetes host-scope IPAM rather than Cilium cluster-scope IPAM. In Kubernetes host-scope mode, the Kubernetes controller manager assigns PodCIDRs and exposes them through spec.podCIDR or spec.podCIDRs in the standard Kubernetes Node resource. Cluster-scope mode is specifically useful when Kubernetes is not configured to perform that allocation or when Cilium should control the cluster address pool.
Therefore, the managing component and resource are the Cilium Operator and CiliumNode , respectively.
Official references
Cluster-Pool IPAM ; Cluster Scope IPAM .
Study Guide topic: Installation and Configuration.
NEW QUESTION # 26
a requirement to achieve service discovery and load balancing across clusters with Cluster Mesh?
Answer: C
Explanation:
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.
NEW QUESTION # 27
What is the issue with the following egress gateway manifest specification?
Egress gateway manifest exhibit
Answer: A
Explanation:
Technical explanation
The manifest specifies both interface: net1 and egressIP: 10.3.4.5 in the same egressGateway configuration.
These properties are mutually exclusive. Cilium ignores an Egress Gateway policy containing both, so A correctly identifies the defect.
When interface is supplied, Cilium uses the selected interface and chooses its first suitable IPv4 and IPv6 addresses as the SNAT addresses. When egressIP is supplied, that address must already be assigned to a network device on the chosen gateway node; Cilium determines the corresponding interface through a route lookup. Administrators may also omit both fields, causing Cilium to select the default-route interface and its addresses.
Option B is incorrect because matchLabels can contain multiple label key-value pairs, as the exhibit does with app: blog and component: backend . Option C is false because the egress address need not be publicly routable; private addresses are valid when routing and upstream network design support them. Option D is false because Cilium does not restrict gateway interfaces to names beginning with eth .
Official references
Cilium Egress Gateway
Study Guide topic: Egress Gateway node selection, interface selection, and SNAT addresses.
NEW QUESTION # 28
Why is the iptables implementation of kube-proxy less scalable than eBPF?
Answer: B
Explanation:
Technical explanation
B expresses the principal scalability distinction intended by the question. In kube-proxy's iptables mode, Kubernetes Services and endpoints are represented by chains of netfilter rules. As the number of Services and backends grows, rule creation, synchronization, and packet traversal can involve increasingly large rule sets.
Matching through those chains is generally described as having linear scaling characteristics.
Cilium's kube-proxy replacement stores service and backend state in eBPF maps. Hash-map lookups allow the datapath to locate service entries without sequentially scanning a rule for every Service, providing effectively constant-time lookup behavior for the relevant map operations. This makes the approach better suited to large and frequently changing Kubernetes environments.
Option A is false because iptables and netfilter also operate within the Linux kernel. Option C is false because kube-proxy's iptables implementation supports IPv6 when the surrounding Kubernetes and host configuration supports it. Option D does not explain kube-proxy's primary scaling limitation and introduces an unrelated SmartNIC/XDP claim.
The constant-time description is a useful architectural simplification; total performance still depends on map sizing, backend selection, connection tracking, and kernel behavior.
Official references
Cilium eBPF Datapath , Cilium Tuning Guide
Study Guide topic: kube-proxy replacement, eBPF maps, and datapath scalability.
NEW QUESTION # 29
Which component is embedded in the Cilium Agent and retrieves eBPF-based visibility from Cilium?
Answer: C
Explanation:
Technical explanation
The Hubble Server is embedded in each Cilium agent and consumes the eBPF-derived visibility data produced on that node. It exposes gRPC services through which clients can retrieve flow events, node and namespace information, server status, and related observability data. Embedding the server in the agent enables high-performance collection with comparatively low overhead.
Hubble Relay has a different role. It is a standalone component that discovers and connects to the Hubble Server instances running across the cluster. Relay aggregates their individual APIs to provide multi-node or cluster-wide visibility to clients such as the Hubble CLI and Hubble UI. It is therefore not the component embedded in the agent.
The Cilium CNI plugin is invoked when Kubernetes creates or removes pods and asks the local agent to configure their networking and datapath. The Cilium Operator performs cluster-wide management duties such as selected IPAM and shared-state operations. Neither component is responsible for exposing eBPF flow visibility.
This server-relay distinction is central to understanding Hubble's distributed architecture: Server provides node-local visibility, while Relay combines multiple servers into a cluster-wide view.
Official references
Hubble Internals , Cilium Component Overview
Study Guide topic: Hubble Server, Hubble Relay, and distributed flow observability.
NEW QUESTION # 30
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