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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: BGP and External Networking | 6% | - External gateway integration - BGP peering and service advertisement |
| Topic 2: Network Observability | 10% | - Layer 7 visibility and flow monitoring - Hubble UI and troubleshooting basics - Hubble architecture and CLI usage |
| Topic 3: Cluster Mesh | 10% | - Multi-cluster connectivity and service discovery - Cross-cluster load balancing and failover |
| Topic 4: Installation and Configuration | 10% | - Post-install validation and connectivity testing - Deployment methods (Helm, cilium-cli) |
| Topic 5: eBPF | 10% | - eBPF fundamentals and relevance to Cilium - eBPF-based networking, security, and observability |
| Topic 6: Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
| Topic 7: Network Policy | 18% | - Identity-aware and L3–L7 policy models - Cilium vs Kubernetes network policies - Policy enforcement modes |
| Topic 8: Service Mesh | 16% | - Transparent traffic encryption - Ingress and Gateway API integration - Sidecar vs sidecarless architecture |
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NEW QUESTION # 55
How does Cilium primarily improve security in Kubernetes clusters?
Answer: D
Explanation:
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.
NEW QUESTION # 56
Which encapsulation protocols are supported when configuring Cilium in tunnel mode?
Answer: A
Explanation:
Technical explanation
Cilium tunnel mode supports VXLAN and Geneve encapsulation. In this routing model, Cilium nodes form an overlay mesh, and traffic exchanged between nodes is carried inside UDP-encapsulated packets. VXLAN is the default tunnel protocol and normally uses UDP port 8472. Geneve is the alternative and normally uses UDP port 6081. Operators select the protocol through the tunnel-protocol configuration setting, whose documented values are vxlan and geneve .
Encapsulation reduces the requirements placed on the underlying network. The underlay only needs to provide IP connectivity between the Kubernetes nodes and permit the selected UDP tunnel port. It does not need to learn or route individual PodCIDRs. Cilium also uses the tunnel metadata to carry information such as the source security identity, avoiding an additional identity lookup on the receiving node.
MPLS, OTV, STT, and EVPN are not supported values for Cilium's tunnel-protocol setting. EVPN may be used in broader data-center network designs, and MPLS is a carrier-routing technology, but neither is a Cilium overlay encapsulation choice. Therefore, B is the only supported pair.
Official references
Cilium Routing ; System Requirements .
Study Guide topic: Architecture.
NEW QUESTION # 57
a requirement to achieve service discovery and load balancing across clusters with Cluster Mesh?
Answer: C
Explanation:
Technical explanation
Every cluster participating in a Cilium Cluster Mesh must have a unique cluster name and numeric cluster ID.
The numeric ID becomes part of Cluster Mesh security identities and allows Cilium to distinguish identities originating in different clusters. Reusing an ID would create ambiguity in endpoint identity, policy enforcement, and synchronized service information. Current documentation permits IDs from 1 through 255 under the default scaling configuration.
Geographical colocation is not required. Cluster Mesh is specifically designed to extend connectivity, policy, service discovery, and load balancing across clusters that may reside in different regions, clouds, or premises, provided the documented network-connectivity requirements are satisfied. The clusters also do not need to use an identical Kubernetes distribution or exact Kubernetes version.
Option C is unnecessarily strict. Current Cilium documentation permits connected clusters to differ by no more than one minor Cilium release; exact version equality is not mandatory. Other prerequisites include unique and non-conflicting PodCIDRs, compatible datapath modes, node connectivity, and appropriate inter- cluster communication.
The supplied bank incorrectly marks A. The verified answer is D.
Official references
Setting up Cluster Mesh .
Study Guide topic: Cluster Mesh.
NEW QUESTION # 58
We observed Hubble output:
Question 7 Hubble flow exhibit
Explain what may have happened:
Answer: A
Explanation:
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.
NEW QUESTION # 59 
Cilium status exhibit
Based on the cilium status output above, what is correct about the Cilium deployment?
For accessibility, the output of the command has been edited.
Answer: D
Explanation:
Technical explanation
The status output reports Operator: OK , followed by Deployment cilium-operator Desired: 1, Ready: 1/1, Available: 1/1 . This establishes that the Cilium Operator is deployed and healthy, making B the intended answer. Cilium uses Kubernetes CustomResourceDefinitions as its default mechanism for storing and propagating cluster state, while the operator performs cluster-wide duties that should be handled once centrally rather than independently on every node.
Option A is contradicted by the exhibit: both hubble-ui and hubble-relay appear as ready deployments and running containers. Option C is incorrect because the resource is explicitly identified as a Deployment ; the cilium agents, by contrast, are shown as a DaemonSet . Option D incorrectly treats the displayed desired replica count as a permanent restriction. A desired count of one describes this installation's current configuration, not a universal maximum.
The exhibit also shows embedded Envoy mode and three healthy Cilium agent instances, but neither detail changes the operator conclusion.
Official references
Cilium Component Overview , Setting up Hubble Observability
Study Guide topic: Cilium components, Cilium Operator, CRD-backed state, and status interpretation.
NEW QUESTION # 60
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