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| Section | Weight | Objectives |
|---|---|---|
| Cluster Mesh | 10% | - Cross-cluster load balancing and failover - Multi-cluster connectivity and service discovery |
| Network Policy | 18% | - Cilium vs Kubernetes network policies - Identity-aware and L3–L7 policy models - Policy enforcement modes |
| Installation and Configuration | 10% | - Post-install validation and connectivity testing - Deployment methods (Helm, cilium-cli) |
| Network Observability | 10% | - Hubble UI and troubleshooting basics - Layer 7 visibility and flow monitoring - Hubble architecture and CLI usage |
| Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
| Service Mesh | 16% | - Sidecar vs sidecarless architecture - Ingress and Gateway API integration - Transparent traffic encryption |
| eBPF | 10% | - eBPF fundamentals and relevance to Cilium - eBPF-based networking, security, and observability |
| BGP and External Networking | 6% | - External gateway integration - BGP peering and service advertisement |
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NEW QUESTION # 26
What is true about Layer 7 protocol visibility in Cilium?
Answer: D
Explanation:
Technical explanation
Layer 7 protocol visibility redirects traffic matching the relevant L7 rules to Cilium's node-local proxy, which is Envoy. Envoy parses supported application protocols and supplies the resulting request or response metadata to Cilium's observability pipeline. Therefore, C correctly identifies the architectural consequence of enabling this visibility.
The feature requires L7 proxy support and an appropriate CiliumNetworkPolicy containing Layer 7 rules. A standard Kubernetes NetworkPolicy is limited to Layer 3 and Layer 4 concepts and cannot express Cilium's HTTP, DNS, or generic application-protocol rules, so B is incorrect.
A is also incorrect. DNS policy and visibility are commonly applied to pod egress queries, and Cilium's model is not restricted to ingress-only DNS visibility. D overstates protocol coverage. Cilium supports defined L7 parsers and policy types-most prominently HTTP, DNS, Kafka, and supported generic Envoy- based protocols-but it does not promise arbitrary visibility for every application protocol. SSH, Telnet, and FTP cannot simply be assumed to receive native semantic parsing.
An operational caveat is that L7 visibility rules also affect policy enforcement: they are not merely passive packet logging instructions.
Official references
Layer 7 Protocol Visibility , Cilium Envoy
Study Guide topic: L7 proxy redirection, CiliumNetworkPolicy, protocol parsing, and Hubble visibility.
NEW QUESTION # 27
Which one of the following best describes the role Cilium provides in Kubernetes?
Answer: C
Explanation:
Technical explanation
Cilium functions as a Kubernetes Container Network Interface implementation. When Kubernetes creates or removes a pod sandbox, the container runtime invokes the configured CNI plugin. Cilium establishes the pod' s network connectivity, connects the workload to the node's networking environment, allocates or obtains an address through the configured IPAM mode, and coordinates the endpoint with the Cilium agent. Its eBPF datapath then supplies routing, service load balancing, policy enforcement, and network visibility.
Cilium provides substantially more functionality than the minimum CNI contract, but those additional capabilities do not change its primary Kubernetes networking role. Hubble supplies integrated network observability, yet Cilium is not merely a container-metrics monitor. Resource utilization such as CPU and memory is normally handled through Kubernetes metrics and monitoring systems.
Cilium is also not a Container Storage Interface. CSI drivers manage storage volumes, attachment, mounting, and lifecycle operations, which are unrelated to Cilium's primary responsibilities. Nor is Cilium simply a pod- operation logging mechanism. It can emit datapath events and diagnostic logs, but those are supporting capabilities.
Accordingly, D provides the correct architectural classification for Cilium in a Kubernetes cluster.
Official references
Introduction to Cilium and Hubble ; Cilium Helm Installation .
Study Guide topic: Architecture.
NEW QUESTION # 28
Which proxy does Cilium use to enforce HTTP and other Layer 7 (L7) policies specified in network policies for the cluster?
Answer: A
Explanation:
Technical explanation
Cilium uses Envoy as its userspace Layer 7 proxy. When a Cilium policy contains HTTP or another supported application-layer rule, Cilium's eBPF datapath identifies matching traffic and redirects it to a node-local Envoy instance. Envoy evaluates the application-layer attributes-such as HTTP method, path, or headers- against the generated policy configuration and then forwards or rejects the request.
The proxy can operate in embedded mode as a separate process inside the Cilium agent pod or as the independently life-cycled cilium-envoy DaemonSet. Both deployment forms use Cilium's optimized Envoy distribution and custom policy-enforcement filters. Communication between the agent and Envoy uses local UNIX-domain sockets for configuration, access logs, and administrative operations.
HAProxy is a capable general-purpose load balancer, but it is not Cilium's L7 policy proxy. Squid primarily serves forward and caching proxy use cases. linkerd2-proxy belongs to the Linkerd service mesh and is not used by Cilium for network-policy enforcement. Consequently, only D identifies the proxy integrated into Cilium's L7 datapath.
Official references
Cilium Envoy , Cilium eBPF Datapath Introduction
Study Guide topic: Envoy proxy integration and Layer 7 policy enforcement.
NEW QUESTION # 29
Which statement is true of both the Ingress Controller and Gateway API?
Answer: D
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 # 30
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: B
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 # 31
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