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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Service Mesh | 16% | - Transparent traffic encryption - Ingress and Gateway API integration - Sidecar vs sidecarless architecture |
| Topic 2: Installation and Configuration | 10% | - Deployment methods (Helm, cilium-cli) - Post-install validation and connectivity testing |
| Topic 3: BGP and External Networking | 6% | - External gateway integration - BGP peering and service advertisement |
| Topic 4: Network Policy | 18% | - Policy enforcement modes - Identity-aware and L3–L7 policy models - Cilium vs Kubernetes network policies |
| Topic 5: Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
| Topic 6: eBPF | 10% | - eBPF fundamentals and relevance to Cilium - eBPF-based networking, security, and observability |
| Topic 7: Network Observability | 10% | - Hubble architecture and CLI usage - Hubble UI and troubleshooting basics - Layer 7 visibility and flow monitoring |
| Topic 8: Cluster Mesh | 10% | - Multi-cluster connectivity and service discovery - Cross-cluster load balancing and failover |
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NEW QUESTION # 59
Which Cilium configuration is recommended to help identify the correct configuration of network policies without interrupting workload communications?
Answer: C
Explanation:
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.
NEW QUESTION # 60
What is the purpose of the 12 Announcements" feature?
Answer: C
Explanation:
Technical explanation
The question's "12 Announcements" wording is a source transcription error for L2 Announcements . This feature makes Kubernetes Services visible and reachable to clients on the local Layer 2 network, particularly in on-premises, office, campus, or bare-metal environments that do not use BGP-based service advertisement.
Cilium responds to ARP requests for IPv4 Service addresses and NDP requests for IPv6 addresses. A selected node advertises the LoadBalancer IP or ExternalIP using its MAC address and receives traffic for that virtual IP. Cilium then applies its service load-balancing functionality to forward the connection to an appropriate backend. Leadership is coordinated so that one node advertises a given Service at a time, and the virtual IP can move to another eligible node after failure.
The feature is not intended to provide general Layer 2 multicast, making A incorrect. DNS service discovery is handled through Kubernetes DNS and is independent of L2 announcements, eliminating C. It also does not define Layer 2 security policies, so D is incorrect.
Thus, the purpose is external Service reachability on the local area network, exactly as described by B.
Official references
L2 Announcements .
Study Guide topic: BGP and External Networking.
NEW QUESTION # 61
Which one of the following Cilium Network Policies follow the correct syntax?
A)
Question 17 option A
B)
Question 17 option B
C)
Question 17 option C
D)
Question 17 option D
Answer: A
Explanation:
Technical explanation
Option D uses the correct structure for permitting egress from selected endpoints to the local host entity. The endpointSelector selects endpoints whose label env equals dev . Because the intended traffic travels from those endpoints toward the host, the policy must contain an egress rule. An egress peer is expressed through toEntities , and host is the reserved entity representing the local host, including host-networked containers on that node.
Option A is invalid because fromEntities is an ingress-oriented field and cannot express an egress destination.
Option B uses nodeSelector , which selects nodes rather than workload endpoints and is only valid for node- level rules in a CiliumClusterwideNetworkPolicy ; it is not valid in the displayed namespaced CiliumNetworkPolicy . It also combines ingress with toEntities , reversing the rule direction. Option C has a valid workload selector but again uses toEntities under ingress ; ingress rules describe sources through constructs such as fromEntities .
Applying option D places the selected endpoints into egress default-deny mode and then expressly permits traffic whose destination is the host entity. Other egress traffic must be allowed separately.
Official references
Policy Enforcement and Rule Basics ; Endpoint Lifecycle policy examples .
Study Guide topic: Network Policy.
NEW QUESTION # 62
Which one of the following commands will correctly display show the Cilium configuration?
Answer: C
Explanation:
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.
NEW QUESTION # 63
This an Ingress configuration. What is the equivalent Gateway API configuration?
Question 19 source Ingress
A)
Question 19 option A
B)
Question 19 option B
C)
Question 19 option C
D)
Question 19 option D
Answer: B
Explanation:
Technical explanation
Option B correctly represents the Ingress as a Gateway and an attached HTTPRoute . The Gateway is named cilium , uses gatewayClassName: cilium , and exposes an HTTP listener on port 80. The HTTPRoute uses parentRefs with the same Gateway name, cilium , so the route attaches to the declared listener. Its two rules preserve the original routing behavior: /details with PathPrefix targets the details Service on port 9080, while / with PathPrefix targets productpage on port 9080.
Option A declares a Gateway named cilium but attaches its route to nginx-gateway . Because the parent reference does not identify the displayed Gateway, it is not equivalent. Options C and D use kind: Route ; the correct resource kind for HTTP path routing is HTTPRoute . They also contain malformed or altered backend and matching fields. Option D changes the details backend name, while option C contains incorrect route structure and path content.
Cilium's official migration example uses the same conversion pattern: the Ingress class becomes the Gateway' s class, paths move into HTTPRoute.rules , and the route identifies its Gateway through parentRefs .
The supplied key incorrectly identifies A. The verified answer is B.
Official references
HTTP Migration Example .
Study Guide topic: Service Mesh.
NEW QUESTION # 64
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