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| Section | Weight | Objectives |
|---|---|---|
| Cluster Mesh | 10% | - Multi-cluster connectivity and service discovery - Cross-cluster load balancing and failover |
| BGP and External Networking | 6% | - BGP peering and service advertisement - External gateway integration |
| Service Mesh | 16% | - Ingress and Gateway API integration - Transparent traffic encryption - Sidecar vs sidecarless architecture |
| eBPF | 10% | - eBPF-based networking, security, and observability - eBPF fundamentals and relevance to Cilium |
| Network Policy | 18% | - Policy enforcement modes - Identity-aware and L3–L7 policy models - Cilium vs Kubernetes network policies |
| Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
| Installation and Configuration | 10% | - Deployment methods (Helm, cilium-cli) - Post-install validation and connectivity testing |
| Network Observability | 10% | - Layer 7 visibility and flow monitoring - Hubble UI and troubleshooting basics - Hubble architecture and CLI usage |
>> Cilium-Associate Testengine <<
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44. Frage
What does this Egress Gateway policy achieve?
Cilium Egress Gateway policy exhibit
Antwort: B
Begründung:
Cilium's official documentation confirms that a CiliumEgressGatewayPolicy selects traffic originating from matching pods , routes traffic destined for the configured destinationCIDRs through the selected egress gateway node, and SNATs that traffic using the configured egressIP.
45. Frage
You are creating a Cilium network policy for pods with the label app: frontend . The policy should allow all pods with that label to communicate with destinations inside 192.168.e.e/24 and using TCP on port 8888.
For example:
# Traffic to 192.168.9.23:8888 should be allowed
# Traffic to 192.168.10.5:8888 should be denied.
# Traffic to 192.168.9.12:5606 should be denied.
Which of the following policies is correct?
A)
Option A
B)
Option B
C)
Option C
D)
Option D
Antwort: B
Begründung:
Technical explanation
Option C has the correct Cilium policy structure. It selects pods labeled app: frontend , creates an egress rule with a valid CIDR entry, and combines that destination constraint with toPorts , port 8888 , and protocol TCP
. Because the CIDR and port restriction are in the same egress rule, traffic must meet both conditions.
Option A uses an unsupported address-range structure with from and to fields rather than CIDR notation.
Option B initially resembles the correct form but contains an additional malformed ports item at the egress- rule level. Option D uses unsupported action: allow and action: deny fields inside toPorts ; Cilium allow and deny behavior is expressed through policy sections such as egress and egressDeny , not per-port action properties.
The item is nevertheless defective. The prose and examples indicate 192.168.9.0/24 , while all displayed CIDR-based options specify 192.168.0.0/24 ; the source text itself shows the corrupted 192.168.e.e/24 . If
192.168.9.0/24 is authoritative, none of the exhibits permits the stated example. The supplied key B is structurally incorrect under the displayed manifests.
Official references
Cilium Layer 3 and CIDR Policies
Study Guide topic: CIDR selectors, Layer 4 ports, and rule composition.
46. Frage
Which Cilium configuration is recommended to help identify the correct configuration of network policies without interrupting workload communications?
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.
47. Frage
How does Cilium primarily improve security in Kubernetes clusters?
Antwort: A
Begründung:
Technical explanation
Cilium primarily improves Kubernetes network security through identity-aware policy enforcement across Layers 3 through 7. Standard Kubernetes NetworkPolicy resources provide Layer 3 and Layer 4 controls, while CiliumNetworkPolicy extends enforcement to application-layer rules. Policies can select workloads by labels and identity, restrict protocols and destination ports, control communication with CIDRs or entities, apply DNS/FQDN rules, and authorize supported HTTP or gRPC operations. This multi-layer enforcement is the capability described by D.
API Gateway and Gateway API configurations can contribute to controlling north-south traffic, but they are not Cilium's primary or comprehensive security mechanism. Database encryption is implemented by database, storage, or encryption-management systems rather than being a general function of Cilium.
Persistent-volume backup is similarly outside Cilium's CNI, network-policy, and observability responsibilities.
Cilium's identity model is especially important in dynamic Kubernetes environments. Security policy follows workload identities derived from labels instead of depending exclusively on changing pod IP addresses. At Layer 7, traffic is redirected to Envoy when protocol-aware inspection or enforcement is required, while eBPF supplies the efficient kernel datapath for lower-layer processing.
Official references
Introduction to Cilium and Hubble ; Network Policy ; Layer 7 Policies .
Study Guide topic: Network Policy.
48. Frage
We observed Hubble output:
Question 7 Hubble flow exhibit
Explain what may have happened:
Antwort: D
Begründung:
Technical explanation
The exhibit records connections originating from default/test and directed to default/test2 , eliminating B and C because those choices reverse the initiating workload. For destination port 80, the flow shows the TCP three-way handshake-SYN, SYN-ACK, and ACK-followed by bidirectional packets with ACK/PSH flags and an orderly FIN exchange. This is the pattern of a successfully established request and response, so the first curl operation succeeded.
The later connection targets port 8080. Hubble records a SYN from test followed by an ACK, RST response from test2 . A reset returned immediately after the connection attempt indicates that the destination rejected or could not accept the connection, commonly because no process was listening on that port. It is not shown as a policy drop; both entries carry the FORWARDED verdict. Thus the network delivered the packets, but the TCP connection itself failed.
Option D is the only choice matching a successful request from test to port 80 and a failed request from test to port 8080. Its displayed IP strings contain source-document transcription defects, but its workload direction, ports, and outcomes match the exhibit.
Official references
Inspecting Network Flows with the CLI ; Troubleshooting with Hubble .
Study Guide topic: Network Observability.
49. Frage
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