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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: eBPF | 10% | - eBPF-based networking, security, and observability - eBPF fundamentals and relevance to Cilium |
| Topic 2: Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
| Topic 3: Network Policy | 18% | - Cilium vs Kubernetes network policies - Identity-aware and L3–L7 policy models - Policy enforcement modes |
| Topic 4: Cluster Mesh | 10% | - Cross-cluster load balancing and failover - Multi-cluster connectivity and service discovery |
| Topic 5: Service Mesh | 16% | - Sidecar vs sidecarless architecture - Ingress and Gateway API integration - Transparent traffic encryption |
| Topic 6: Installation and Configuration | 10% | - Post-install validation and connectivity testing - Deployment methods (Helm, cilium-cli) |
| Topic 7: Network Observability | 10% | - Layer 7 visibility and flow monitoring - Hubble UI and troubleshooting basics - Hubble architecture and CLI usage |
| Topic 8: BGP and External Networking | 6% | - BGP peering and service advertisement - External gateway integration |
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NEW QUESTION # 43
What would be a benefit of using remote service affinity in a Cluster Mesh deployment?
Answer: A
Explanation:
Technical explanation
Remote service affinity directs a global Service to prefer healthy backend endpoints located in remote clusters. This can support maintenance or staged rollouts in which the local copy of an application is temporarily unavailable or intentionally removed from service. Requests originating in the local cluster continue through the same global Service but are forwarded to the preferred remote backends, matching the use case described by D.
Cilium configures this behavior through the service.cilium.io/affinity: "remote" annotation. The preference affects backend selection; it does not require clients to use a different Service address. If remote backends are available, they are marked as preferred. This provides operators with a controlled way to direct traffic away from the local deployment during an update.
Option A describes local affinity from the perspective of the cluster containing the client, not remote affinity.
Option B incorrectly introduces the Egress Gateway, which provides controlled source addresses and routing for outbound traffic rather than Cluster Mesh global-Service affinity. Option C describes the normal none affinity behavior, under which Cilium has no local-or-remote preference and can load-balance across both categories.
Remote affinity therefore enables temporary cross-cluster continuity while local application instances are updated or otherwise unavailable.
Official references
Cluster Mesh Service Affinity .
Study Guide topic: Cluster Mesh.
NEW QUESTION # 44
Please review the output of cilium status below and answer the question that follows. Please note, the output has been modified for accessibility purposes.
Question 2 cilium status exhibit
Assume the cluster is healthy. What is correct about the ci 1 ium status command output above?
Answer: B
Explanation:
Technical explanation
The status output shows Envoy DaemonSet: disabled (using embedded mode) . In embedded mode, Cilium starts Envoy as a separate process inside the Cilium agent pod when a feature requiring Layer 7 processing- such as an L7 network policy, protocol visibility, Ingress, or Gateway API-is used. This is precisely the behavior described in option B.
The remaining choices contradict the exhibit. The Cilium DaemonSet has a desired count of three, which ordinarily indicates three schedulable nodes running Cilium, not four. Hubble Relay: OK means the aggregation component is healthy. Hubble Relay connects to the Hubble instances associated with Cilium agents and presents a multi-node API to clients such as Hubble CLI and Hubble UI. Finally, ClusterMesh:
disabled rules out the claim that the installation is currently configured for Cilium Cluster Mesh service discovery and cross-cluster load balancing.
Cilium can alternatively run Envoy through the independently life-cycled cilium-envoy DaemonSet. That is not the deployment displayed here because the DaemonSet is explicitly disabled and embedded mode is reported.
Official references
Envoy deployment modes ; Hubble internals .
Study Guide topic: Architecture.
NEW QUESTION # 45
Which question does Hubble provide the information to answer?
Answer: B
Explanation:
Technical explanation
Hubble provides network and security flow observability derived from Cilium's datapath. Its flow records include source and destination workloads, namespaces, identities, ports, protocols, forwarding verdicts, and drop reasons. Hubble can therefore identify services or workloads whose connections were rejected by network policy. The Hubble CLI supports filtering by verdict, such as --verdict DROPPED , and official examples show events labeled Policy denied DROPPED . These capabilities directly answer the question posed in option D.
Option B, which is marked as correct in the supplied bank, is not supported by the stated functionality.
Hubble may expose network-layer or supported application-layer metadata, including DNS and HTTP information when Layer 7 visibility is configured, but it is not a database query profiler and cannot determine which internal SQL statement ran longest merely from ordinary Hubble flows. Similarly, CPU utilization is a workload-resource metric normally obtained through Kubernetes metrics, Prometheus, or another monitoring system. Cilium BGP configuration is examined through Cilium configuration and BGP status commands rather than inferred from Hubble network flows.
The supplied answer key should therefore be corrected from B to D.
Official references
Inspecting Network Flows with the Hubble CLI ; Hubble internals .
Study Guide topic: Network Observability.
NEW QUESTION # 46
What is the default policy enforcement behavior?
Answer: D
Explanation:
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.
NEW QUESTION # 47
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
Answer: C
Explanation:
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.
NEW QUESTION # 48
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