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| Section | Weight | Objectives |
|---|---|---|
| Network Policy | 18% | - Policy Rules and Enforcement - Identity-Based Network Security |
| eBPF | 10% | - eBPF and iptables-Based Networking - eBPF Role and Benefits |
| Cluster Mesh | 10% | - Service Discovery and Load Balancing - Multi-Cluster Connectivity |
| BGP and External Networking | 6% | - Connecting Cilium Clusters to External Networks - Egress Connectivity |
| Architecture | 20% | - IP Address Management and Datapath Models - Cilium Architecture and Components |
| Network Observability | 10% | - Hubble and Layer 7 Visibility - Hubble CLI and UI |
| Installation and Configuration | 10% | - Installation and Connectivity Testing - Cilium CLI and Configuration |
| Service Mesh | 16% | - Ingress and Gateway API - Traffic Encryption and Service Mesh Architectures |
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NEW QUESTION # 27
You need to expose an application over HTTPS on your Cilium-managed Kubernetes cluster The security team has specifically asked for traffic to be encrypted all the way from the external clients to the Service.
Which option should you use?
Answer: A
Explanation:
Technical explanation
The requirement is that traffic remain encrypted all the way from the external client to the backend Service .
Therefore, TLS must not terminate at the Cilium Gateway/Envoy proxy .
With TLS Passthrough , Cilium forwards the encrypted TLS stream to the backend without decrypting the application traffic. Envoy can inspect the TLS ClientHello/SNI sufficiently to select the appropriate backend, but the TLS session itself continues to the Service. Cilium specifically supports TLS passthrough with the Gateway API TLSRoute resource .
By contrast, TLS Terminate + HTTPRoute decrypts the connection at the Gateway. Although a separate encrypted connection to the backend can be configured in some architectures, that is not the same as preserving the original end-to-end TLS session requested here. Cilium's HTTPS Gateway examples use TLS termination when the Gateway itself handles the certificate.
Study Guide topic: Service Mesh.
NEW QUESTION # 28
Which command is used to enable logging at the debug log level of Cilium agents7
Answer: D
Explanation:
Technical explanation
cilium config set debug true follows the supported Cilium CLI configuration syntax and sets the debug configuration key to true . The cilium config set command accepts a key/value pair and, by default, restarts the Cilium pods so that the changed configuration is applied. The Cilium configuration documentation defines debug as the setting that enables full debug mode. This increases agent logging verbosity and causes eBPF programs to emit additional visibility events for diagnostic use.
Options A, B, and D do not match documented Cilium CLI command structures. There is no cilium log level
--set=debug command in the Cilium CLI hierarchy, and neither cilium logging.level=debug nor cilium logging debug is valid configuration syntax. A Helm-managed installation may also enable debugging through the chart value debug.enabled=true , but that does not make any of the alternative commands correct.
Debug mode should be enabled deliberately because it increases log volume and may generate additional datapath visibility information. After troubleshooting, operators should normally restore the previous setting to avoid unnecessary operational overhead.
The supplied answer key incorrectly identifies B. The verified answer is C.
Official references
Cilium configuration ; Cilium CLI `config set` ; Helm values .
Study Guide topic: Installation and Configuration.
NEW QUESTION # 29
Which one of the following service mesh features and use cases is natively supported by Cilium?
Answer: D
Explanation:
Technical explanation
The intended answer is A because API request limiting corresponds to rate limiting, which Cilium identifies as a core Layer 7 traffic-management capability. Cilium combines its eBPF datapath with Envoy for application-layer processing. The official Service Mesh documentation expressly includes rate limiting among the functions that must understand protocols such as HTTP, REST, gRPC, and WebSocket. It is therefore not merely packet-rate policing at Layer 3 or Layer 4; it can be applied with application-protocol context.
However, this question is no longer valid as a strict single-answer item. Current Cilium documentation also describes proxy-based Layer 7 load balancing as useful for gRPC and provides an Envoy-backed implementation for Kubernetes Services. Consequently, option C is also supportable under the current product documentation, although the feature is identified as beta. API authorization and fault-delay injection are not presented as equivalent first-class Cilium Service Mesh use cases in the cited feature overview.
For certification-bank purposes, retain A as the intended answer, but revise option C or qualify it to restore a unique correct choice.
Official references
Service Mesh ; Proxy Load Balancing for Kubernetes Services .
Study Guide topic: Service Mesh.
NEW QUESTION # 30
Which statement is true about Mutual Authentication with Cilium?
Answer: D
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 # 31
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: D
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 # 32
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