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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Architecture | 20% | - CNI integration and kube-proxy replacement - Cilium core architecture and components |
| Topic 2: BGP and External Networking | 6% | - External gateway integration - BGP peering and service advertisement |
| Topic 3: Cluster Mesh | 10% | - Multi-cluster connectivity and service discovery - Cross-cluster load balancing and failover |
| Topic 4: Network Policy | 18% | - Cilium vs Kubernetes network policies - Policy enforcement modes - Identity-aware and L3–L7 policy models |
| Topic 5: Installation and Configuration | 10% | - Deployment methods (Helm, cilium-cli) - Post-install validation and connectivity testing |
| Topic 6: Service Mesh | 16% | - Transparent traffic encryption - Sidecar vs sidecarless architecture - Ingress and Gateway API integration |
| Topic 7: Network Observability | 10% | - Layer 7 visibility and flow monitoring - Hubble UI and troubleshooting basics - Hubble architecture and CLI usage |
| Topic 8: eBPF | 10% | - eBPF-based networking, security, and observability - eBPF fundamentals and relevance to Cilium |
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NEW QUESTION # 52
What is NOT a valid description of the sidecar-based model?
Answer: A
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 # 53
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: C
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 # 54
Which statement is true of both the Ingress Controller and Gateway API?
Answer: A
Explanation:
Technical explanation
Both Kubernetes Ingress and the north-south use of Gateway API provide declarative Layer 7 routing from clients outside the cluster to Kubernetes workloads. They express host- and path-based routing through Kubernetes resources and can be implemented by controllers such as Cilium's Envoy-based ingress implementation. A therefore captures their shared purpose most accurately.
The remaining choices describe differences rather than universal similarities. Gateway API is explicitly role- oriented: infrastructure administrators manage GatewayClass and often Gateway , while application owners manage route resources such as HTTPRoute . The Ingress API does not provide the same formal separation of administrative and application-facing resources, making C unsuitable as a statement about both.
Implementation-specific annotations are historically common with Ingress because its core API is limited.
Gateway API was deliberately designed with more expressive, portable resource fields so that implementations do not need to depend as heavily on vendor-specific annotations; D is consequently not true of both. Namespace behavior also differs because Gateway API provides controlled cross-namespace attachment and reference mechanisms. B is therefore not the defining common capability.
Official references
Cilium Kubernetes Ingress Support , Cilium Gateway API Support , Migrating from Ingress to Gateway API Study Guide topic: Kubernetes north-south routing, Ingress, and Gateway API.
NEW QUESTION # 55
What is true about Layer 7 protocol visibility in Cilium?
Answer: B
Explanation:
Technical explanation
Layer 7 protocol visibility redirects traffic matching the relevant L7 rules to Cilium's node-local proxy, which is Envoy. Envoy parses supported application protocols and supplies the resulting request or response metadata to Cilium's observability pipeline. Therefore, C correctly identifies the architectural consequence of enabling this visibility.
The feature requires L7 proxy support and an appropriate CiliumNetworkPolicy containing Layer 7 rules. A standard Kubernetes NetworkPolicy is limited to Layer 3 and Layer 4 concepts and cannot express Cilium's HTTP, DNS, or generic application-protocol rules, so B is incorrect.
A is also incorrect. DNS policy and visibility are commonly applied to pod egress queries, and Cilium's model is not restricted to ingress-only DNS visibility. D overstates protocol coverage. Cilium supports defined L7 parsers and policy types-most prominently HTTP, DNS, Kafka, and supported generic Envoy- based protocols-but it does not promise arbitrary visibility for every application protocol. SSH, Telnet, and FTP cannot simply be assumed to receive native semantic parsing.
An operational caveat is that L7 visibility rules also affect policy enforcement: they are not merely passive packet logging instructions.
Official references
Layer 7 Protocol Visibility , Cilium Envoy
Study Guide topic: L7 proxy redirection, CiliumNetworkPolicy, protocol parsing, and Hubble visibility.
NEW QUESTION # 56
Which Cilium command should you execute to gather network-related troubleshooting information from your Kubernetes cluster?
Answer: B
Explanation:
Technical explanation
The intended answer is D, but the option contains a source-bank typographical error. The valid command is cilium sysdump , not cilium sysduwp . Read literally, none of the four displayed commands exactly answers the question.
The Cilium CLI's sysdump operation gathers cluster-wide troubleshooting material, including Cilium configuration and endpoint state, agent and operator logs, Kubernetes workload information, routing and interface details, kernel messages, service state, policies, and selected eBPF-map output. This consolidated archive is the preferred diagnostic package when investigating Kubernetes networking or preparing a support report.
cilium status --verbose provides expanded health and deployment status, but it does not collect the comprehensive diagnostic archive requested. debuginfo is associated with the in-agent debug client- currently documented as cilium-dbg debuginfo -and produces useful local-agent API information; in Kubernetes environments it is already included as part of the system dump. cilium bugtool is not the current cluster-wide Cilium CLI command requested here.
For an exam-ready correction, option D should read cilium sysdump .
Official references
Cilium Troubleshooting and Sysdump
Study Guide topic: Cilium CLI troubleshooting, system dumps, and diagnostic collection.
NEW QUESTION # 57
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