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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Service Mesh | 16% | - Ingress and Gateway API - Traffic Encryption and Service Mesh Architectures |
| Topic 2: BGP and External Networking | 6% | - Connecting Cilium Clusters to External Networks - Egress Connectivity |
| Topic 3: Network Observability | 10% | - Hubble and Layer 7 Visibility - Hubble CLI and UI |
| Topic 4: Cluster Mesh | 10% | - Multi-Cluster Connectivity - Service Discovery and Load Balancing |
| Topic 5: eBPF | 10% | - eBPF and iptables-Based Networking - eBPF Role and Benefits |
| Topic 6: Network Policy | 18% | - Identity-Based Network Security - Policy Rules and Enforcement |
| Topic 7: Architecture | 20% | - Cilium Architecture and Components - IP Address Management and Datapath Models |
| Topic 8: Installation and Configuration | 10% | - Installation and Connectivity Testing - Cilium CLI and Configuration |
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NEW QUESTION # 59
The Cilium Agent is deployed as part of the Cilium installation. What of the following is true about the Cilium Agent?
Answer: A
Explanation:
Technical explanation
For every pod managed by Cilium, the responsible node-local Cilium agent creates a CiliumEndpoint object with the same name and namespace. The object exposes endpoint state such as labels, the allocated security identity, addressing information, and effective policy. The agents also create endpoint objects for their inter- agent health endpoints. B is therefore correct.
The other responsibilities belong primarily to the Cilium Operator. The operator normally registers Cilium's CustomResourceDefinitions, manages addresses for LoadBalancer Services when LB IPAM is active, and performs configured cluster-wide synchronization or shared-state operations. It also garbage-collects orphaned CiliumEndpoint resources when their associated pods no longer exist or have permanently completed.
The Cilium agent itself runs on each node. It responds to workload lifecycle events, creates and manages local endpoints, loads eBPF programs, applies policies, and maintains the node's datapath. This division ensures that latency-sensitive forwarding and endpoint operations remain node-local while logically cluster-wide activities are consolidated in the operator.
Official references
CiliumEndpoint CRD , Cilium Operator Responsibilities
Study Guide topic: Cilium agent, Cilium Operator, and CiliumEndpoint lifecycle.
NEW QUESTION # 60
You are tasked to install Cilium and enable transparent encryption in a cluster in which the following conditions applies:
# Internal cluster traffic is IPv6-only
# The current cluster is running on 5001 nodes
# The cluster is planned to connect to another cluster which has 5001 nodes through Cluster Mesh What are your recommendations regarding transparent encryption?
Answer: D
Explanation:
Technical explanation
A is a supported recommendation: Cilium's WireGuard implementation provides transparent encryption between Cilium-managed endpoints, works with Cluster Mesh, and distributes node public keys to remote clusters through clustermesh-apiserver . All participating clusters must enable WireGuard, and inter-cluster firewalls must permit UDP port 51871. IPv6-only pod traffic does not inherently disqualify WireGuard.
However, this question is no longer uniquely answerable from current Cilium documentation. Current IPsec documentation supports IPv6 pod-to-pod connectivity and sets its cluster or Cluster Mesh limit at more than
65,535 nodes. The described mesh contains 10,002 nodes, so option B is also technically supportable under the stated facts. The older distinction apparently assumed by the supplied key is no longer sufficient to exclude IPsec.
Options C and D are definitively false. Ten thousand and two nodes remain below the documented IPsec ceiling, and transparent encryption is not restricted to IPv4. WireGuard may still be selected for its automatic per-node key-pair distribution and simpler Cluster Mesh integration, but workload performance, kernel support, firewall rules, key-management requirements, and operational testing should inform a production recommendation.
Official references
WireGuard Transparent Encryption , IPsec Transparent Encryption
Study Guide topic: Transparent-encryption selection, IPv6, Cluster Mesh, and scaling limits.
NEW QUESTION # 61
What is the default policy enforcement behavior?
Answer: A
NEW QUESTION # 62
Which question does Hubble provide the information to answer?
Answer: B
Explanation:
Technical explanation
Hubble provides network and security flow observability derived from Cilium's datapath. Its flow records include source and destination workloads, namespaces, identities, ports, protocols, forwarding verdicts, and drop reasons. Hubble can therefore identify services or workloads whose connections were rejected by network policy. The Hubble CLI supports filtering by verdict, such as --verdict DROPPED , and official examples show events labeled Policy denied DROPPED . These capabilities directly answer the question posed in option D.
Option B, which is marked as correct in the supplied bank, is not supported by the stated functionality.
Hubble may expose network-layer or supported application-layer metadata, including DNS and HTTP information when Layer 7 visibility is configured, but it is not a database query profiler and cannot determine which internal SQL statement ran longest merely from ordinary Hubble flows. Similarly, CPU utilization is a workload-resource metric normally obtained through Kubernetes metrics, Prometheus, or another monitoring system. Cilium BGP configuration is examined through Cilium configuration and BGP status commands rather than inferred from Hubble network flows.
The supplied answer key should therefore be corrected from B to D.
Official references
Inspecting Network Flows with the Hubble CLI ; Hubble internals .
Study Guide topic: Network Observability.
NEW QUESTION # 63
If you are required to block ingress traffic from external IPs for all pods in your cluster, which of the following network policies would be the best fit?
Answer: D
Explanation:
Technical explanation
A cluster-wide requirement is best implemented with CiliumClusterwideNetworkPolicy , whose correct resource spelling is CiliumClusterwideNetworkPolicy . Unlike a namespaced CiliumNetworkPolicy , this Cilium CRD is non-namespaced and can select endpoints across the entire cluster.
To deny external ingress for every Cilium-managed pod, a cluster-wide policy can use an empty endpointSelector and an ingressDeny rule selecting the world entity. Cilium defines world as network endpoints outside the cluster. An alternative allow-list construction can permit only the cluster entity, thereby excluding external sources, but an explicit deny rule usually communicates the requirement more directly.
A standard Kubernetes NetworkPolicy and a CiliumNetworkPolicy are namespaced, requiring repeated resources in every applicable namespace. CiliumGlobalPolicy is not a valid Cilium resource type. Although the option capitalizes "Wide" differently from the actual kind, D unmistakably identifies the intended cluster- scoped policy.
Official references
Cilium Deny Policies , Cilium Network Policy Types
Study Guide topic: Cluster-scoped policies, external traffic, and reserved entities.
NEW QUESTION # 64
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