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| Section | Weight | Objectives |
|---|---|---|
| Service Mesh | 16% | - Ingress and Gateway API - Traffic Encryption and Service Mesh Architectures |
| Architecture | 20% | - IP Address Management and Datapath Models - Cilium Architecture and Components |
| Network Observability | 10% | - Hubble CLI and UI - Hubble and Layer 7 Visibility |
| BGP and External Networking | 6% | - Connecting Cilium Clusters to External Networks - Egress Connectivity |
| Installation and Configuration | 10% | - Installation and Connectivity Testing - Cilium CLI and Configuration |
| eBPF | 10% | - eBPF Role and Benefits - eBPF and iptables-Based Networking |
| Network Policy | 18% | - Identity-Based Network Security - Policy Rules and Enforcement |
| Cluster Mesh | 10% | - Service Discovery and Load Balancing - Multi-Cluster Connectivity |
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NEW QUESTION # 27
What would be a benefit of using remote service affinity in a Cluster Mesh deployment?
Answer: D
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 # 28
What is a correct statement related to BIG TCP, an eBPF-based feature in Cilium?
Answer: D
Explanation:
Technical explanation
BIG TCP permits the Linux networking stack to process packets larger than the traditional approximately 64- KiB limit represented by the IP length field while the packets remain inside the host. IPv6 BIG TCP uses a temporary Hop-by-Hop header carrying the larger internal length, while IPv4 BIG TCP sets tot_len to zero and uses the socket buffer length internally. Before transmission, packets are segmented into sizes suitable for the physical network. C therefore identifies the problem BIG TCP addresses.
Option A is false because Cilium's documentation explicitly states that BIG TCP does not require network- interface MTU changes. The larger objects exist inside the software networking stack and are segmented before appearing on the wire.
Option B reverses the intended performance effect. Larger internal GSO and GRO packets reduce repeated stack traversal, lowering CPU utilization and generally improving throughput and latency. Option D is also false: Generic Segmentation Offload and Generic Receive Offload are fundamental to BIG TCP's operation.
Cilium increases their maximum sizes when BIG TCP is enabled. The source mentions TSO, but the documented mechanism is principally described through GSO and GRO.
Official references
Cilium Performance Tuning and BIG TCP
Study Guide topic: BIG TCP, GSO/GRO, packet-length limits, and performance.
NEW QUESTION # 29
Please review the output of cilium status below and answer the question that follows. Please note, the output has been modified for accessibility purposes.
Question 2 cilium status exhibit
Assume the cluster is healthy. What is correct about the ci 1 ium status command output above?
Answer: B
Explanation:
Technical explanation
The status output shows Envoy DaemonSet: disabled (using embedded mode) . In embedded mode, Cilium starts Envoy as a separate process inside the Cilium agent pod when a feature requiring Layer 7 processing- such as an L7 network policy, protocol visibility, Ingress, or Gateway API-is used. This is precisely the behavior described in option B.
The remaining choices contradict the exhibit. The Cilium DaemonSet has a desired count of three, which ordinarily indicates three schedulable nodes running Cilium, not four. Hubble Relay: OK means the aggregation component is healthy. Hubble Relay connects to the Hubble instances associated with Cilium agents and presents a multi-node API to clients such as Hubble CLI and Hubble UI. Finally, ClusterMesh:
disabled rules out the claim that the installation is currently configured for Cilium Cluster Mesh service discovery and cross-cluster load balancing.
Cilium can alternatively run Envoy through the independently life-cycled cilium-envoy DaemonSet. That is not the deployment displayed here because the DaemonSet is explicitly disabled and embedded mode is reported.
Official references
Envoy deployment modes ; Hubble internals .
Study Guide topic: Architecture.
NEW QUESTION # 30
You must add Hubble to your Kubernetes cluster where Cilium is NOT the installed CNI. Your cluster is already running in production and you must minimise downtime.
Which method is the most appropriate?
Answer: D
Explanation:
Technical explanation
Hubble obtains its visibility from Cilium's eBPF datapath, and the Hubble Server is embedded in the Cilium agent. Hubble therefore cannot provide its normal flow-observability capabilities as a standalone installation without Cilium, eliminating B.
CNI chaining allows Cilium to coexist with a supported existing CNI. The original plugin continues to supply base connectivity and IP address management, while Cilium attaches eBPF programs to the created network devices. Those programs provide visibility, policy enforcement, and other Cilium functionality. Hubble can then be enabled on top of the chained Cilium deployment. This approach avoids an immediate, disruptive replacement of the production cluster's networking layer and is consequently the best answer.
Options C and D could be appropriate in broader migration projects, particularly when a current CNI is incompatible with chaining or when full native-Cilium functionality is required. However, both imply substantially more workload movement or cutover activity than the stated objective of minimizing downtime.
Compatibility, chaining mode, current CNI behavior, kernel requirements, and feature limitations must still be validated before production rollout.
Official references
Cilium CNI Chaining , Hubble Internals , Troubleshooting Hubble
Study Guide topic: Hubble prerequisites, CNI chaining, and production adoption.
NEW QUESTION # 31
Which Cilium configuration is recommended to help identify the correct configuration of network policies without interrupting workload communications?
Answer: A
Explanation:
Technical explanation
Policy Audit Mode allows administrators to evaluate the consequences of network policies before enforcing their deny decisions. Traffic that would ordinarily be rejected remains permitted, while Cilium records an audit verdict. These verdicts can be examined with Cilium monitoring tools and used to identify legitimate communications that are missing from the proposed policies.
This is especially valuable when introducing host policies or default-deny controls into an existing environment. An incomplete policy might otherwise block access to the Kubernetes API, node-management interfaces, DNS, monitoring systems, or other operational dependencies. The recommended workflow is to enable audit mode, observe traffic and policy verdicts, adjust the rules, confirm that all required communications receive allow verdicts, and then disable audit mode to begin enforcement.
DNS enforcement mode and HTTP audit mode are not the general Cilium configuration requested. "Policy enforcement mode" describes whether policies are normally enforced, but it does not provide the non- disruptive learning behavior in the question.
Audit mode should be treated as a temporary validation mechanism because it does not actually block disallowed traffic and does not persist across every agent-restart scenario.
Official references
Cilium Policy Audit Mode
Study Guide topic: Policy validation, audit verdicts, and safe policy rollout.
NEW QUESTION # 32
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