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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Observability | 10% | - Hubble CLI and UI - Hubble and Layer 7 Visibility |
| Topic 2: Installation and Configuration | 10% | - Cilium CLI and Configuration - Installation and Connectivity Testing |
| Topic 3: Network Policy | 18% | - Identity-Based Network Security - Policy Rules and Enforcement |
| Topic 4: eBPF | 10% | - eBPF and iptables-Based Networking - eBPF Role and Benefits |
| Topic 5: Cluster Mesh | 10% | - Service Discovery and Load Balancing - Multi-Cluster Connectivity |
| Topic 6: Architecture | 20% | - IP Address Management and Datapath Models - Cilium Architecture and Components |
| Topic 7: Service Mesh | 16% | - Ingress and Gateway API - Traffic Encryption and Service Mesh Architectures |
| Topic 8: BGP and External Networking | 6% | - Egress Connectivity - Connecting Cilium Clusters to External Networks |
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NEW QUESTION # 13
Which affirmation is true about eBPF host-routing?
Answer: D
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 # 14
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 # 15
What is the default policy enforcement behavior?
Answer: D
NEW QUESTION # 16
Which component manages the allocation of per-node PodCIDRs in the cluster-scope IPAM (IP address management) mode?
Answer: C
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 # 17
A user has set up a global service as a Kubernetes user with access to clusters in a Cilium Cluster Mesh. They notice that all traffic is going to remote backend pods. What is a possible explanation?
Answer: C
Explanation:
Technical explanation
If a global Service has no healthy local endpoints matching its selector, every available backend can be remote. Cluster Mesh synchronizes remote service and endpoint information, allowing the local Cilium datapath to load-balance requests to backend pods in connected clusters. The absence of local endpoints therefore provides a direct explanation for the observed behavior.
If the local cluster were not part of the Cluster Mesh, its Cilium agents would not normally receive the remote endpoint state needed to route traffic through the global Service, so B does not explain successful remote-only selection. An affinity value of none is the default behavior and expresses no preference between local and remote endpoints. When both categories exist and are healthy, this permits load balancing across both; it does not require every connection to use remote backends.
Setting service.cilium.io/shared: "false" prevents the local Service's backends from being shared with remote clusters. It does not instruct the local cluster to direct all requests toward remote endpoints.
A separate possible cause, not presented among the choices, would be service.cilium.io/affinity: "remote" .
Among the supplied answers, however, A is the valid explanation.
Official references
Service Affinity ; Cluster Mesh .
Study Guide topic: Cluster Mesh.
NEW QUESTION # 18
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