Linux Foundation Updated Cilium-Associate Exam Questions and Answers by benny

Technical explanation

Ingress provides a comparatively simple API for exposing HTTP and HTTPS applications through host- and path-based routing. Gateway API is a broader, extensible family of resources that separates infrastructure configuration from application routing. Resources such as GatewayClass , Gateway , HTTPRoute , GRPCRoute , TLSRoute , TCPRoute , and UDPRoute model listeners, routes, protocols, ownership, and attachment relationships explicitly.

Gateway API was designed around operational roles. An infrastructure provider can manage the GatewayClass , a cluster operator can provision a Gateway , and an application team can own a route attached to that Gateway. This offers clearer delegation than the single Ingress resource and supports protocols and traffic-management functions beyond the original Ingress model.

The two APIs are not simply different names for identical functionality, so A is false. Option C is also inaccurate because Cilium’s implementations of both Ingress and Gateway API integrate with its eBPF datapath and Envoy; Ingress is not inherently an iptables-only implementation. Option D incorrectly limits Gateway API to internal routing. It can expose internet-facing applications through generated LoadBalancer or NodePort Services or through host-network listeners.

Official references

Migrating from Ingress to Gateway ; Gateway API Support .

Study Guide topic: Service Mesh.

Technical explanation

cilium config view is the Cilium CLI command used to display the current Cilium configuration. It reads the configuration associated with the selected Kubernetes context, Cilium namespace, and Helm release. The command belongs to the cilium config command group, which manages installation configuration.

Option B reverses the expected command structure and does not correspond to a documented Cilium CLI operation. Option D resembles command syntax used on traditional network appliances but is not part of the Cilium CLI. Option C is both textually corrupted and conceptually inaccurate: Cilium configuration is not generally exposed through a cluster-wide resource named ciliumconfig.cilium.io . Runtime settings are commonly represented through the Cilium ConfigMap and Helm release values, while specialized resources such as CiliumNodeConfig apply targeted per-node configuration.

The wording “display show” is a source-bank editing defect but does not affect the answer. Administrators should also distinguish the external cilium management CLI from cilium-dbg , which runs with or communicates with the node-local Cilium agent and provides detailed datapath and agent diagnostics.

Official references

cilium config view , Cilium Component Overview

Study Guide topic: Cilium CLI configuration inspection and command structure.

Technical explanation

In Cilium’s default policy-enforcement mode, an endpoint initially permits ingress and egress traffic. Enforcement changes independently for each direction when a policy selects that endpoint. If a selecting rule contains an ingress section, the endpoint enters default-deny mode for ingress. If a selecting rule contains an egress section, it enters default-deny mode for egress. Only traffic explicitly permitted by the applicable policy rules remains allowed in the restricted direction.

This per-direction behavior is important. An ingress-only policy does not automatically restrict egress, and an egress-only policy does not automatically restrict ingress. Options A and B reverse the relationship between the rule section and the direction being enforced. Option C incorrectly states that selection places the endpoint into default-allow mode; default allow describes the endpoint’s condition before it is selected by an enforcing policy.

Cilium also supports always and never enforcement modes. In always , enforcement applies even to endpoints not selected by policy. In never , policy enforcement is disabled. Policies can additionally use enableDefaultDeny for specialized visibility configurations, but those controls do not change the normal default behavior described in the question.

Official references

Policy Enforcement Modes .

Study Guide topic: Network Policy.

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.