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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Architecture | 20% | - Understand the Role of Cilium in Kubernetes Environments
|
| Topic 2: eBPF | 10% | - Understand the Role of eBPF in Cilium
|
| Topic 3: BGP and External Networking | 6% | - Egress Connectivity Requirements
|
| Topic 4: Network Observability | 10% | - Understand the Observability Capabilities of Hubble
|
| Topic 5: Service Mesh | 16% | - Know How to use Ingress or Gateway API for Ingress Routing
|
| Topic 6: Installation and Configuration | 10% | - Know How to Use Cilium CLI to Query and Modify the Configuration
|
| Topic 7: Cluster Mesh | 10% | - Understand the Benefits of Cluster Mesh for Multi-cluster Connectivity
|
| Topic 8: Network Policy | 18% | - Interpret Cilium Network Policies and Intent
|
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NEW QUESTION # 32
Which of these is true of Cilium Cluster Mesh and Network Policies?
Answer: A
Explanation:
Technical explanation
Cluster Mesh extends Cilium's identity-aware networking and policy enforcement across connected Kubernetes clusters. A CiliumNetworkPolicy can authorize communication with workloads in a particular remote cluster by selecting their workload labels together with the synthetic io.cilium.k8s.policy.cluster label.
Therefore, A accurately describes a direct network-policy function.
The policies themselves are not automatically copied between clusters. Administrators remain responsible for applying the required policy resources in the appropriate clusters, but enforcement can select and govern remote endpoints once Cluster Mesh has propagated their identities.
Option B confuses authorization with transport encryption. WireGuard or IPsec configuration enables transparent encryption; it is not established by a network-policy rule. Option C is also separate from policy enforcement: cross-cluster load balancing is configured through global-service facilities and service annotations, not through CiliumNetworkPolicy . Option D is incorrect under current documentation because Cilium mutual authentication does not provide a single trust domain spanning Cluster Mesh clusters and is not presently compatible with that multi-cluster arrangement.
Official references
Cluster Mesh Network Policy , Cluster Mesh Services , Mutual Authentication Limitations Study Guide topic: Cross-cluster identity, endpoint selection, and policy enforcement.
NEW QUESTION # 33
When using Cilium with the kube-proxy replacement enabled, which underlying technology is effectively replaced with eBPF?
Answer: C
Explanation:
Technical explanation
Kubernetes kube-proxy conventionally implements Service translation and load balancing through either iptables or IPVS. With Cilium's kube-proxy replacement enabled, eBPF programs and maps perform Kubernetes Service handling directly in the kernel, including ClusterIP, NodePort, LoadBalancer, ExternalIP, and related service translation functions. C is therefore correct.
The replacement can operate at socket hooks and packet-processing hooks. Service and backend information is stored in eBPF maps, allowing the datapath to select backends and perform address translation without traversing the kube-proxy-generated iptables or IPVS rules normally used for Kubernetes Services.
BGP is not replaced. Cilium's BGP Control Plane is a separate feature used to advertise routes and service addresses to external routers. Routing itself is also not eliminated; Cilium can implement and accelerate routing decisions with eBPF, but packets still require a valid forwarding model. firewalld is a host firewall- management service and is not the underlying Kubernetes Service implementation replaced by kube-proxy replacement.
Relevant installations must satisfy the kernel and device requirements for Cilium's eBPF service load- balancer functionality.
Official references
Kubernetes Without kube-proxy
Study Guide topic: kube-proxy replacement, eBPF service maps, iptables, and IPVS.
NEW QUESTION # 34
Which component manages the allocation of per-node PodCIDRs in the cluster-scope IPAM (IP address management) mode?
Answer: A
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 # 35
What is the default policy enforcement behavior?
Answer: B
NEW QUESTION # 36
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 # 37
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