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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Observability | 10% | - Hubble architecture and CLI usage - Hubble UI and troubleshooting basics - Layer 7 visibility and flow monitoring |
| Topic 2: Service Mesh | 16% | - Sidecar vs sidecarless architecture - Transparent traffic encryption - Ingress and Gateway API integration |
| Topic 3: Installation and Configuration | 10% | - Post-install validation and connectivity testing - Deployment methods (Helm, cilium-cli) |
| Topic 4: Network Policy | 18% | - Cilium vs Kubernetes network policies - Identity-aware and L3–L7 policy models - Policy enforcement modes |
| Topic 5: BGP and External Networking | 6% | - External gateway integration - BGP peering and service advertisement |
| Topic 6: eBPF | 10% | - eBPF fundamentals and relevance to Cilium - eBPF-based networking, security, and observability |
| Topic 7: Cluster Mesh | 10% | - Multi-cluster connectivity and service discovery - Cross-cluster load balancing and failover |
| Topic 8: Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
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NEW QUESTION # 45
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: B
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 # 46
As a Kubernetes user, you have deployed the following Cilium Network Policy:
Cilium Layer 7 network policy exhibit
The network policy is not having any effect. What Is the Issue?
Answer: B
Explanation:
Technical explanation
The policy attaches an HTTP Layer 7 rule to port 80 but omits protocol: TCP from the associated ports entry.
HTTP policy is layered on a Layer 4 TCP rule, and the documented Cilium form explicitly identifies TCP before specifying the HTTP method and path. D therefore identifies the configuration defect intended by the question.
The cross-namespace source selection is valid. The policy resides in namespace back and selects backend pods there. Its fromEndpoints selector explicitly includes k8s:io.kubernetes.pod.namespace: blog , allowing it to select matching app-frontend endpoints in that other namespace. Option A is consequently not an error.
The k8s: source prefix in k8s:app.kubernetes.io/name is also valid Cilium label syntax and identifies the Kubernetes label source, making B false. Port 80 may be used in a Cilium policy; the privileged-port restriction concerns which processes may bind low-numbered ports under operating-system permissions, not whether a network policy can reference them.
The corrected port entry should contain port: "80" together with protocol: TCP .
Official references
Cilium Layer 7 Policies , Kubernetes Constructs in Cilium Policy
Study Guide topic: Combining Layer 4 port rules with Layer 7 HTTP policies.
NEW QUESTION # 47
What is NOT a valid description of the sidecar-based model?
Answer: C
Explanation:
Technical explanation
C is not a valid description. A service-mesh sidecar externalizes networking functions into a proxy container running beside the application; it does not force the instrumentation logic into the application's source code.
In fact, a core service-mesh objective is to provide connectivity, security, traffic management, and observability transparently without requiring application-code changes.
The operational concerns in the other choices are characteristic of sidecar implementations. A proxy must be injected into each workload pod, increasing container count and potentially affecting pod initialization, resource consumption, ordering, and readiness. Adding a sidecar to an existing pod template normally requires the pods to be recreated because Kubernetes cannot dynamically add a new container to an already- running pod.
Traffic interception also directs application traffic through the sidecar proxy and its network namespace paths, adding network-stack traversal and proxy-processing overhead. Cilium's service-mesh design can instead use node-level Envoy proxies together with eBPF traffic redirection, avoiding one proxy container in every application pod. This preserves transparent application behavior while reducing the per-workload operational burden.
Official references
Cilium Service Mesh , Cilium Ingress and Network Policy Example
Study Guide topic: Sidecar-based and sidecar-free service-mesh architectures.
NEW QUESTION # 48
What is a correct statement related to BIG TCP, an eBPF-based feature in Cilium?
Answer: A
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 # 49
What is correct about this Cilium Network Policy?
Question 21 Cilium Network Policy exhibit
Answer: C
Explanation:
Technical explanation
The intended policy selects every Cilium-managed endpoint in the namespace where the CiliumNetworkPolicy is created because endpointSelector: {} is empty. The manifest does not specify metadata.namespace ; if it is applied normally in the default namespace, the selected endpoints are therefore all pods in default , not pods across every namespace. The egress destination selector identifies pods in kube- system carrying k8s-app: kube-dns , while matchPattern: "*" allows all DNS query names handled by the DNS rule. This supports the intended answer A.
There is, however, a material defect in the exhibit: toPorts is a list in the Cilium policy schema, but the image shows rules directly beneath toPorts without a preceding list marker. The official form is toPorts: , followed by - ports: and rules: within that list item. Port 53 and its protocol should also be stated explicitly. Exactly as displayed, the manifest should not be treated as a valid deployable policy.
The question should be corrected before examination use. Once the missing list item and port definition are restored, A accurately describes its scope and effect.
Official references
Using Kubernetes Constructs in Policy ; Layer 7 Protocol Visibility .
Study Guide topic: Network Policy.
NEW QUESTION # 50
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