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| Section | Weight | Objectives |
|---|---|---|
| BGP and External Networking | 6% | - External gateway integration - BGP peering and service advertisement |
| Network Policy | 18% | - Identity-aware and L3–L7 policy models - Policy enforcement modes - Cilium vs Kubernetes network policies |
| Cluster Mesh | 10% | - Cross-cluster load balancing and failover - Multi-cluster connectivity and service discovery |
| Architecture | 20% | - CNI integration and kube-proxy replacement - Cilium core architecture and components |
| Installation and Configuration | 10% | - Post-install validation and connectivity testing - Deployment methods (Helm, cilium-cli) |
| Network Observability | 10% | - Hubble architecture and CLI usage - Hubble UI and troubleshooting basics - Layer 7 visibility and flow monitoring |
| eBPF | 10% | - eBPF fundamentals and relevance to Cilium - eBPF-based networking, security, and observability |
| Service Mesh | 16% | - Transparent traffic encryption - Ingress and Gateway API integration - Sidecar vs sidecarless architecture |
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NEW QUESTION # 53
In which use case can the Cilium Service Mesh exclusively utilize eBPF without requiring a proxy such as Envoy?
Answer: B
Explanation:
Technical explanation
Cilium can implement Layer 3 and Layer 4 forwarding exclusively through its eBPF datapath. IP, TCP, and UDP traffic can be routed, load-balanced, filtered, and redirected through eBPF programs attached to Linux networking hooks. These operations depend on network-layer addresses, protocols, ports, identities, and connection state; they do not require application-protocol parsing by a userspace proxy.
Application-layer operations are different. Cilium's official Service Mesh architecture uses a proxy such as Envoy to parse HTTP, gRPC, and DNS when Layer 7 policy, observability, or traffic management requires understanding individual requests. The eBPF datapath transparently redirects selected traffic to the node-local proxy and retains identity context, while Envoy performs the protocol-aware operation.
Kafka parsing is also an application-layer activity rather than ordinary Layer 3 or Layer 4 forwarding.
Moreover, current Cilium releases removed the former Envoy Go extension mechanism used for Kafka and generic proxylib rules, further reinforcing that it is not an eBPF-only forwarding case.
Therefore, D accurately identifies the scenario in which the Service Mesh datapath can remain entirely in the kernel without requiring Envoy.
Official references
Cilium Service Mesh ; eBPF Datapath Introduction .
Study Guide topic: Service Mesh.
NEW QUESTION # 54
What would be a benefit of using remote service affinity in a Cluster Mesh deployment?
Answer: A
Explanation:
Technical explanation
Remote service affinity directs a global Service to prefer healthy backend endpoints located in remote clusters. This can support maintenance or staged rollouts in which the local copy of an application is temporarily unavailable or intentionally removed from service. Requests originating in the local cluster continue through the same global Service but are forwarded to the preferred remote backends, matching the use case described by D.
Cilium configures this behavior through the service.cilium.io/affinity: "remote" annotation. The preference affects backend selection; it does not require clients to use a different Service address. If remote backends are available, they are marked as preferred. This provides operators with a controlled way to direct traffic away from the local deployment during an update.
Option A describes local affinity from the perspective of the cluster containing the client, not remote affinity.
Option B incorrectly introduces the Egress Gateway, which provides controlled source addresses and routing for outbound traffic rather than Cluster Mesh global-Service affinity. Option C describes the normal none affinity behavior, under which Cilium has no local-or-remote preference and can load-balance across both categories.
Remote affinity therefore enables temporary cross-cluster continuity while local application instances are updated or otherwise unavailable.
Official references
Cluster Mesh Service Affinity .
Study Guide topic: Cluster Mesh.
NEW QUESTION # 55
Which statement is true about Mutual Authentication with Cilium?
Answer: B
Explanation:
Technical explanation
SPIRE supplies workload identities as SPIFFE Verifiable Identity Documents, including X.509 key material used for mutual authentication. SPIFFE's identity model supports automatic issuance, rotation, and revocation, allowing short-lived certificates to be renewed without manually distributing static credentials.
This makes D the correct statement.
Option A reverses the documented default. Cilium's default SPIRE installation requires persistent-volume support. In-memory storage can be selected for laboratory environments by disabling server data storage, but that setting causes SPIRE data to be recreated if the server pod restarts. Option B also reverses the relationship between the projects: SPIFFE defines the identity standards and APIs, while SPIRE is a production-ready implementation of SPIFFE. Cilium's mutual-authentication integration has been validated with SPIRE.
Option C overstates the operational requirement. A SPIRE server is involved, but Cilium's Helm chart can deploy and configure the supported SPIRE server and per-node agents. Administrators may provide their own deployment, yet a completely manual installation is not mandatory.
Current documentation classifies this mutual-authentication implementation as beta and notes limitations, including incompatibility with Cluster Mesh trust domains. Those maturity constraints do not change the certificate-management behavior described in D.
Official references
Cilium Mutual Authentication .
Study Guide topic: Service Mesh.
NEW QUESTION # 56
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 # 57
The Cilium Agent is deployed as part of the Cilium installation. What of the following is true about the Cilium Agent?
Answer: D
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 # 58
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