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| Section | Weight | Objectives |
|---|---|---|
| Service Mesh | 16% | - Know How to use Ingress or Gateway API for Ingress Routing
|
| Network Policy | 18% | - Interpret Cilium Network Policies and Intent
|
| Installation and Configuration | 10% | - Know How to Use Cilium CLI to Query and Modify the Configuration
|
| Architecture | 20% | - Understand the Role of Cilium in Kubernetes Environments
|
| Cluster Mesh | 10% | - Understand the Benefits of Cluster Mesh for Multi-cluster Connectivity
|
| eBPF | 10% | - Understand the Role of eBPF in Cilium
|
| BGP and External Networking | 6% | - Egress Connectivity Requirements
|
| Network Observability | 10% | - Understand the Observability Capabilities of Hubble
|
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NEW QUESTION # 41
Which of these observability features is NOT supported by Hubble?
Answer: D
Explanation:
Technical explanation
Hubble does not obtain Layer 7 protocol visibility exclusively through eBPF without a proxy. By default, Cilium's datapath exposes Layer 3 and Layer 4 flow information. To produce supported application-layer events, traffic is selected through an L7 Cilium policy and redirected to the node-local Envoy proxy. Envoy parses the application protocol and forwards access-log information that Cilium and Hubble expose as Layer
7 flow events.
The other capabilities are supported. Hubble flow records contain the observing node, and the CLI provides node-based filtering. HTTP-aware flows can contain response status codes, enabling inspection or filtering for results such as 200 and 404. Hubble also records forwarding verdicts and drop reasons. Operators can filter for DROPPED traffic and distinguish policy-denied connections from forwarded traffic and other failure conditions.
This separation is fundamental to Cilium's architecture: eBPF provides efficient kernel-level forwarding, security enforcement, and L3/L4 observability, while Envoy supplies protocol parsing when request-level context is required. The integration remains transparent to applications, but the proxy is still present in the traffic path for Layer 7 visibility.
Therefore, B describes the unsupported mechanism and is the correct answer.
Official references
Layer 7 Protocol Visibility ; Envoy ; Hubble CLI .
Study Guide topic: Network Observability.
NEW QUESTION # 42
What is correct about the Kubernetes Host Scope IP Address Management (IPAM) mode?
Answer: B
Explanation:
Technical explanation
Kubernetes host-scope IPAM can be used with both Cilium tunnel routing and native direct routing. The IPAM mechanism determines how each node receives and locally allocates pod addresses; it does not inherently require a particular packet-forwarding model. The current IPAM feature matrix explicitly marks both tunnel routing and direct routing as supported for Kubernetes host-scope mode.
In this mode, Kubernetes allocates a PodCIDR to each node and publishes it through the standard v1.Node resource, normally in spec.podCIDR or spec.podCIDRs . The Cilium agent waits for the relevant range and allocates individual pod addresses from that node-specific CIDR. The correct configuration is ipam:
kubernetes or the Helm equivalent ipam.mode=kubernetes , not ipam: crd ; therefore, C is false.
The documented feature matrix does not provide multiple CIDRs per cluster or multiple CIDRs per node for this mode, eliminating A and B. Multi-pool IPAM is the Cilium mode designed for allocating per-node CIDRs from multiple configurable pools.
Because Kubernetes host-scope IPAM supports either overlay tunneling or direct routing while the other statements contradict its capabilities or configuration, D is correct.
Official references
IP Address Management ; Kubernetes Host Scope .
Study Guide topic: Installation and Configuration.
NEW QUESTION # 43
Which affirmation is true about eBPF host-routing?
Answer: C
Explanation:
Technical explanation
C accurately describes eBPF host-routing. In a conventional datapath, packets may traverse substantial portions of the host networking stack and its iptables hooks even when Cilium performs routing decisions with eBPF. eBPF host-routing takes a more direct datapath, bypassing iptables and the upper host stack while providing a faster transition between the host and pod network namespaces. This reduces processing and context-switching overhead and can improve throughput and latency.
Option A describes load-balancing behavior rather than host routing. Backend distribution is implemented through Cilium's service load-balancer maps and algorithms. Host routing can improve the path used by resulting packets, but it does not itself guarantee even backend selection.
Option B is the description of BIG TCP. BIG TCP increases the size of internal GSO and GRO packets to reduce stack traversal. Although BIG TCP requires eBPF host-routing in supported Cilium configurations, the two are distinct features.
Option D is overly specific and does not define the feature. Host routing optimizes compatible pod traffic generally, subject to kernel, kube-proxy-replacement, masquerading, netfilter, encryption, and integration constraints.
Official references
Cilium eBPF Host-Routing
Study Guide topic: eBPF host-routing, host-stack bypass, veth traversal, and performance.
NEW QUESTION # 44
Which one of the following best describes the role Cilium provides in Kubernetes?
Answer: A
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 # 45
Which component is embedded in the Cilium Agent and retrieves eBPF-based visibility from Cilium?
Answer: A
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 # 46
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