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Linux Foundation Cilium-Associate Exam Syllabus Topics:

Section	Weight	Objectives
BGP and External Networking	6%	- Connecting Cilium Clusters to External Networks - Egress Connectivity
Network Policy	18%	- Identity-Based Network Security - Policy Rules and Enforcement
Cluster Mesh	10%	- Service Discovery and Load Balancing - Multi-Cluster Connectivity
eBPF	10%	- eBPF Role and Benefits - eBPF and iptables-Based Networking
Network Observability	10%	- Hubble and Layer 7 Visibility - Hubble CLI and UI
Architecture	20%	- IP Address Management and Datapath Models - Cilium Architecture and Components
Service Mesh	16%	- Traffic Encryption and Service Mesh Architectures - Ingress and Gateway API
Installation and Configuration	10%	- Cilium CLI and Configuration - Installation and Connectivity Testing

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Linux Foundation Cilium Certified AssociateCCA Cilium-Associate Prüfungsfragen mit Lösungen (Q39-Q44):

39. Frage
Which Cilium configuration is recommended to help identify the correct configuration of network policies without interrupting workload communications?

A. HTTP audit mode
B. Policy enforcement mode
C. DNS enforcement mode
D. Policy audit mode

Antwort: D

Begründung:
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.

40. Frage
What is the default policy enforcement behavior?

A. If any rule selects an Endpoint and the rule has an ingress section, the Endpoint goes Into default allow at egress, f any rule selects an Endpoint and the rule has an egress section, the Endpoint goes into default allow at ingress.
B. If any rule selects an Endpoint and the rule has an ingress section, the Endpoint goes Into default deny at egress. f any rule selects an Endpoint and the rule has an egress section, the Endpoint goes into default deny at ingress.
C. If any rule selects an Endpoint and the rule has an ingress section, the Endpoint goes Into default allow at Ingress, f any rule selects an Endpoint and the rule has an egress section, the Endpoint goes into default allow at egress.
D. If any rule selects an Endpoint and the rule has an ingress section, the Endpoint goes into default deny at ingress. f any rule selects an Endpoint and the rule has an egress section, the Endpoint goes into default deny at egress.

Antwort: D

Begründung:
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.

41. Frage
Which proxy does Cilium use to enforce HTTP and other Layer 7 (L7) policies specified in network policies for the cluster?

A. HAProxy
B. Envoy
C. Squid
D. Linkerd2-proxy

Antwort: B

Begründung:
Technical explanation
Cilium uses Envoy as its userspace Layer 7 proxy. When a Cilium policy contains HTTP or another supported application-layer rule, Cilium's eBPF datapath identifies matching traffic and redirects it to a node-local Envoy instance. Envoy evaluates the application-layer attributes-such as HTTP method, path, or headers- against the generated policy configuration and then forwards or rejects the request.
The proxy can operate in embedded mode as a separate process inside the Cilium agent pod or as the independently life-cycled cilium-envoy DaemonSet. Both deployment forms use Cilium's optimized Envoy distribution and custom policy-enforcement filters. Communication between the agent and Envoy uses local UNIX-domain sockets for configuration, access logs, and administrative operations.
HAProxy is a capable general-purpose load balancer, but it is not Cilium's L7 policy proxy. Squid primarily serves forward and caching proxy use cases. linkerd2-proxy belongs to the Linkerd service mesh and is not used by Cilium for network-policy enforcement. Consequently, only D identifies the proxy integrated into Cilium's L7 datapath.
Official references
Cilium Envoy , Cilium eBPF Datapath Introduction
Study Guide topic: Envoy proxy integration and Layer 7 policy enforcement.

42. Frage
After enabling Layer 7 visibility, you can now observe DNS domains and FQDN in your Hubble logs, like the one below.
Nov 16 13:52:07.279: endor/xwing-9bd8f454d-m46mm:34706 (ID:3817) < > example.com:443 (ID:
16777217) Policy denied DROPPED (TCP Flags SYN)
Which of these Hubble CLI commands could have returned the output above?

A. hubble observe --to-fqdn example.co* --from-namespace endor --to-port 443 --verdict FORWARDED
B. hubble observe --to-fqdn example.con --from-namespace endor --to-port 443 --verdict DROPPED
C. hubble observe --to-fqdn example.cow --from-namespace kube-system --to-port 443 --verdict DROPPED
D. hubble obs erve --to-fqdn example.con --fro # -namespace endor --to-port 80 --verdict DROPPED

Antwort: B

Begründung:
Technical explanation
A is clearly the intended answer because its filters correspond to the displayed source namespace ( endor ), destination port ( 443 ), and verdict ( DROPPED ). However, it contains example.con , whereas the observed flow names example.com . Therefore, none of the options would literally return this exact flow if the FQDN filter is matched as written. The corrected command is:
hubble observe --to-fqdn example.com --from-namespace endor --to-port 443 --verdict DROPPED Option B is malformed in two additional places and filters port 80 rather than 443. Option C selects the wrong FQDN and source namespace. Option D requests forwarded flows, directly contradicting the Policy denied DROPPED verdict; its wildcard also does not repair the verdict mismatch.
Hubble's observe filters are cumulative: a returned flow must satisfy the specified destination FQDN, originating namespace, destination port, and verdict. Layer 7 visibility is enabled with a Cilium network policy containing the relevant L7 rules, which redirects selected traffic through the proxy so that application- level details can be reported.
Official references
Inspecting Network Flows with the Hubble CLI , Layer 7 Protocol Visibility Study Guide topic: Hubble flow filtering, FQDN visibility, namespaces, ports, and verdicts.

43. Frage
Review the Cilium Network Policy in the YAML file.
It was deployed in the ns-cca namespace on cluster1

Cluster Mesh CiliumNetworkPolicy exhibit
Which statement Is correct?

A. This policy will allow traffic from a Pod named ship in ns-cca namespace in clusterl to a Pod named base in ns-cca namespace in cluster2.
B. This policy will deny traffic from a Pod named ship in ns-cca namespace in clusterl to a Pod named base in ns-cca namespace in cluster2.
C. This policy will deny traffic from a Pod named ship in ns-cca namespace in clusterl to a Pod named base in default namespace in cluster2.
D. This policy will allow traffic from a Pod named ship in ns-cca namespace in clusterl to a Pod named base in default namespace in cluster2.

Antwort: A

Begründung:
Technical explanation
The policy's endpointSelector selects the ship workload in the namespace containing the CiliumNetworkPolicy , which is ns-cca . It also explicitly includes io.cilium.k8s.policy.cluster: cluster1 , confirming that the selected source endpoint belongs to cluster1.
The egress rule authorizes communication to an endpoint carrying name: base and the cluster label io.cilium.
k8s.policy.cluster: cluster2 . Because the namespaced policy does not specify a different destination namespace through k8s:io.kubernetes.pod.namespace , the intended destination is the corresponding base workload in ns-cca on cluster2. Therefore, A matches the policy.
Options C and D incorrectly describe the rule as a deny rule. Cilium policy rules use an allow-list model unless an explicit egressDeny or ingressDeny section is present. The exhibit contains an ordinary egress rule, so matching traffic is authorized. Option B incorrectly places the destination in default .
Current Cilium versions require explicit cluster targeting for remote endpoints, which this policy provides through the cluster label.
Official references
Cluster Mesh Network Policy , Namespaces in Cilium Policy
Study Guide topic: Cluster Mesh labels, namespaced policies, and cross-cluster endpoint selection.

44. Frage
......

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