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| Section | Weight | Objectives |
|---|---|---|
| eBPF | 10% | - eBPF fundamentals and relevance to Cilium - eBPF-based networking, security, and observability |
| Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
| BGP and External Networking | 6% | - BGP peering and service advertisement - External gateway integration |
| Installation and Configuration | 10% | - Post-install validation and connectivity testing - Deployment methods (Helm, cilium-cli) |
| Network Policy | 18% | - Identity-aware and L3–L7 policy models - Cilium vs Kubernetes network policies - Policy enforcement modes |
| Cluster Mesh | 10% | - Multi-cluster connectivity and service discovery - Cross-cluster load balancing and failover |
| Network Observability | 10% | - Hubble architecture and CLI usage - Layer 7 visibility and flow monitoring - Hubble UI and troubleshooting basics |
| Service Mesh | 16% | - Ingress and Gateway API integration - Sidecar vs sidecarless architecture - Transparent traffic encryption |
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NEW QUESTION # 30
Which statement is true of both the Ingress Controller and Gateway API?
Answer: A
Explanation:
Technical explanation
Both Kubernetes Ingress and the north-south use of Gateway API provide declarative Layer 7 routing from clients outside the cluster to Kubernetes workloads. They express host- and path-based routing through Kubernetes resources and can be implemented by controllers such as Cilium's Envoy-based ingress implementation. A therefore captures their shared purpose most accurately.
The remaining choices describe differences rather than universal similarities. Gateway API is explicitly role- oriented: infrastructure administrators manage GatewayClass and often Gateway , while application owners manage route resources such as HTTPRoute . The Ingress API does not provide the same formal separation of administrative and application-facing resources, making C unsuitable as a statement about both.
Implementation-specific annotations are historically common with Ingress because its core API is limited.
Gateway API was deliberately designed with more expressive, portable resource fields so that implementations do not need to depend as heavily on vendor-specific annotations; D is consequently not true of both. Namespace behavior also differs because Gateway API provides controlled cross-namespace attachment and reference mechanisms. B is therefore not the defining common capability.
Official references
Cilium Kubernetes Ingress Support , Cilium Gateway API Support , Migrating from Ingress to Gateway API Study Guide topic: Kubernetes north-south routing, Ingress, and Gateway API.
NEW QUESTION # 31
Why is the iptables implementation of kube-proxy less scalable than eBPF?
Answer: A
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 # 32
Which one of the following commands will correctly display show the Cilium configuration?
Answer: B
Explanation:
Technical explanation
cilium config view is the Cilium CLI command used to display the current Cilium configuration. It reads the configuration associated with the selected Kubernetes context, Cilium namespace, and Helm release. The command belongs to the cilium config command group, which manages installation configuration.
Option B reverses the expected command structure and does not correspond to a documented Cilium CLI operation. Option D resembles command syntax used on traditional network appliances but is not part of the Cilium CLI. Option C is both textually corrupted and conceptually inaccurate: Cilium configuration is not generally exposed through a cluster-wide resource named ciliumconfig.cilium.io . Runtime settings are commonly represented through the Cilium ConfigMap and Helm release values, while specialized resources such as CiliumNodeConfig apply targeted per-node configuration.
The wording "display show" is a source-bank editing defect but does not affect the answer. Administrators should also distinguish the external cilium management CLI from cilium-dbg , which runs with or communicates with the node-local Cilium agent and provides detailed datapath and agent diagnostics.
Official references
cilium config view , Cilium Component Overview
Study Guide topic: Cilium CLI configuration inspection and command structure.
NEW QUESTION # 33
What is the issue with the following egress gateway manifest specification?
Egress gateway manifest exhibit
Answer: D
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 # 34
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 # 35
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