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| Section | Weight | Objectives |
|---|---|---|
| eBPF | 10% | - eBPF and iptables-Based Networking - eBPF Role and Benefits |
| Network Observability | 10% | - Hubble CLI and UI - Hubble and Layer 7 Visibility |
| Architecture | 20% | - IP Address Management and Datapath Models - Cilium Architecture and Components |
| Network Policy | 18% | - Policy Rules and Enforcement - Identity-Based Network Security |
| Service Mesh | 16% | - Traffic Encryption and Service Mesh Architectures - Ingress and Gateway API |
| Cluster Mesh | 10% | - Multi-Cluster Connectivity - Service Discovery and Load Balancing |
| BGP and External Networking | 6% | - Connecting Cilium Clusters to External Networks - Egress Connectivity |
| Installation and Configuration | 10% | - Installation and Connectivity Testing - Cilium CLI and Configuration |
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質問 # 29
Among the definitions provided for the entities host, remote-node, cluster, and all, which description is accurate in the context of Cilium network policy?
正解：B
解説：
Technical explanation
The host entity represents the local node on which the selected Cilium endpoint resides. It also includes processes and containers using the local host network namespace. Therefore, A reproduces the official entity definition accurately.
The remote-node entity does not represent arbitrary unmanaged endpoints. It represents hosts other than the local node across the local cluster and connected clusters, including host-networked containers on those nodes. Unmanaged endpoints instead have the reserved unmanaged identity.
Option C gives the definition of the separate kube-apiserver entity, not cluster . The cluster entity is the logical collection of endpoints and reserved identities inside the local cluster, including Cilium-managed endpoints, unmanaged local endpoints, hosts, remote nodes, health, ingress, initialization, and kube-apiserver identities. Current documentation separately provides a cluster-mesh entity for endpoints in connected clusters.
Option D confuses all with world . world represents endpoints outside the cluster. all covers all identities and is not simply equivalent to the IPv4 CIDR 0.0.0.0/0 , particularly in identity-aware, node, and IPv6 contexts.
Official references
Cilium Layer 3 Policy Entities , Cilium Reserved Identities
Study Guide topic: Reserved entities and identity-based Layer 3 policies.
質問 # 30
We observed Hubble output:
Question 7 Hubble flow exhibit
Explain what may have happened:
正解：D
解説：
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.
質問 # 31
Which one of the following best describes the role Cilium provides in Kubernetes?
正解：A
解説：
Technical explanation
Cilium functions as a Kubernetes Container Network Interface implementation. When Kubernetes creates or removes a pod sandbox, the container runtime invokes the configured CNI plugin. Cilium establishes the pod' s network connectivity, connects the workload to the node's networking environment, allocates or obtains an address through the configured IPAM mode, and coordinates the endpoint with the Cilium agent. Its eBPF datapath then supplies routing, service load balancing, policy enforcement, and network visibility.
Cilium provides substantially more functionality than the minimum CNI contract, but those additional capabilities do not change its primary Kubernetes networking role. Hubble supplies integrated network observability, yet Cilium is not merely a container-metrics monitor. Resource utilization such as CPU and memory is normally handled through Kubernetes metrics and monitoring systems.
Cilium is also not a Container Storage Interface. CSI drivers manage storage volumes, attachment, mounting, and lifecycle operations, which are unrelated to Cilium's primary responsibilities. Nor is Cilium simply a pod- operation logging mechanism. It can emit datapath events and diagnostic logs, but those are supporting capabilities.
Accordingly, D provides the correct architectural classification for Cilium in a Kubernetes cluster.
Official references
Introduction to Cilium and Hubble ; Cilium Helm Installation .
Study Guide topic: Architecture.
質問 # 32
A Kubernetes cluster is not currently running Cilium as a CNI, but the user would like to benefit from Hubbies observability capabilities on your cluster. Which one of the following options is NOT possible?
正解：B
解説：
Technical explanation
Hubble is Cilium's integrated observability layer and consumes flow events produced by Cilium's eBPF datapath and embedded Hubble servers. The Hubble CLI is only a client; downloading its binary does not install a standalone datapath or create flow data on a cluster that lacks Cilium. Option B is therefore the operation that is not possible.
The other approaches represent recognized Cilium deployment or migration models. A direct migration can replace the CNI configuration and recycle workloads or nodes, although a naive cluster-wide transition can disrupt connectivity. CNI chaining allows Cilium to operate with another CNI: the existing plugin continues to provide basic connectivity and IP address management, while Cilium attaches eBPF programs to the created interfaces to provide visibility, policy, and other functions. Cilium also documents migration through dual overlays. In that model, the old and new networks coexist temporarily, nodes are moved in a controlled sequence, and workloads attached to either overlay retain connectivity when the documented addressing and routing requirements are met.
The supplied bank incorrectly marks A. The verified answer is B because Hubble requires Cilium-managed observability data.
Official references
Setting up Hubble Observability ; CNI Chaining ; Migrating a cluster to Cilium .
Study Guide topic: Installation and Configuration.
質問 # 33
Which Cilium command should you execute to gather network-related troubleshooting information from your Kubernetes cluster?
正解：D
解説：
Technical explanation
The intended answer is D, but the option contains a source-bank typographical error. The valid command is cilium sysdump , not cilium sysduwp . Read literally, none of the four displayed commands exactly answers the question.
The Cilium CLI's sysdump operation gathers cluster-wide troubleshooting material, including Cilium configuration and endpoint state, agent and operator logs, Kubernetes workload information, routing and interface details, kernel messages, service state, policies, and selected eBPF-map output. This consolidated archive is the preferred diagnostic package when investigating Kubernetes networking or preparing a support report.
cilium status --verbose provides expanded health and deployment status, but it does not collect the comprehensive diagnostic archive requested. debuginfo is associated with the in-agent debug client- currently documented as cilium-dbg debuginfo -and produces useful local-agent API information; in Kubernetes environments it is already included as part of the system dump. cilium bugtool is not the current cluster-wide Cilium CLI command requested here.
For an exam-ready correction, option D should read cilium sysdump .
Official references
Cilium Troubleshooting and Sysdump
Study Guide topic: Cilium CLI troubleshooting, system dumps, and diagnostic collection.
質問 # 34
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