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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Observability | 10% | - Hubble CLI and UI - Hubble and Layer 7 Visibility |
| Topic 2: Installation and Configuration | 10% | - Cilium CLI and Configuration - Installation and Connectivity Testing |
| Topic 3: eBPF | 10% | - eBPF and iptables-Based Networking - eBPF Role and Benefits |
| Topic 4: BGP and External Networking | 6% | - Egress Connectivity - Connecting Cilium Clusters to External Networks |
| Topic 5: Cluster Mesh | 10% | - Multi-Cluster Connectivity - Service Discovery and Load Balancing |
| Topic 6: Service Mesh | 16% | - Ingress and Gateway API - Traffic Encryption and Service Mesh Architectures |
| Topic 7: Architecture | 20% | - Cilium Architecture and Components - IP Address Management and Datapath Models |
| Topic 8: Network Policy | 18% | - Identity-Based Network Security - Policy Rules and Enforcement |
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20. Frage
You are managing two Kubernetes clusters, labeled as Cluster A and Cluster B, both of which have Cilium installed. You want to mesh Cluster A and Cluster B together The following characteristics define these clusters:
# Both clusters are configured In encapsulation mode.
# The PodCIDR ranges differ: Cluster A uses 192.168.0.0723, while Cluster B uses 192.168.2.0/24.
# There is IP connectivity between the nodes in all clusters using their respective InternallP addresses.
# The network infrastructure between the clusters enables inter-cluster communication.
# Cluster A runs Kubernetes version 1.28, and Cluster B runs Kubernetes version 1.27.
# Cilium versions also differ, with Cluster A using version 1.14 and Cluster B using version 1.13.
# Both clusters share the same cluster name and cluster ID.
# The Cilium certificate authority differs between Cluster A and Cluster B.
Is it possible to create a cluster mesh given the conditions?
Antwort: D
Begründung:
Technical explanation
A Cluster Mesh can be created after assigning each cluster a unique name and numeric cluster ID. Cilium uses the cluster ID when constructing Cluster Mesh security identities, so duplicate values cannot safely identify endpoints from different clusters. The name must likewise be unique. These values can be changed after installation, although all existing workloads must then be restarted so their security identities are regenerated.
The other listed conditions are compatible. Both clusters use the same encapsulation datapath mode, their PodCIDRs are intended to be non-overlapping, and the nodes possess the required inter-cluster connectivity.
Different Kubernetes patch or minor versions do not inherently prevent Cluster Mesh. Cilium versions may differ by one minor release, so versions 1.14 and 1.13 satisfy the documented compatibility rule.
Different certificate authorities are not an irreversible blocker under current documentation. Every cluster must trust certificates presented by the others. Operators may use a shared root CA or configure a CA bundle containing all trusted CA certificates. Consequently, B is too absolute. C is also false because changing the cluster identity is possible, subject to workload restarts. D is unnecessary because a one-minor Cilium difference is supported.
The source's option A is truncated, but its intended corrective action is technically accurate.
Official references
Setting up Cluster Mesh .
Study Guide topic: Cluster Mesh.
21. Frage
What is NOT a valid description of the sidecar-based model?
Antwort: C
Begründung:
Technical explanation
C is not a valid description. A service-mesh sidecar externalizes networking functions into a proxy container running beside the application; it does not force the instrumentation logic into the application's source code.
In fact, a core service-mesh objective is to provide connectivity, security, traffic management, and observability transparently without requiring application-code changes.
The operational concerns in the other choices are characteristic of sidecar implementations. A proxy must be injected into each workload pod, increasing container count and potentially affecting pod initialization, resource consumption, ordering, and readiness. Adding a sidecar to an existing pod template normally requires the pods to be recreated because Kubernetes cannot dynamically add a new container to an already- running pod.
Traffic interception also directs application traffic through the sidecar proxy and its network namespace paths, adding network-stack traversal and proxy-processing overhead. Cilium's service-mesh design can instead use node-level Envoy proxies together with eBPF traffic redirection, avoiding one proxy container in every application pod. This preserves transparent application behavior while reducing the per-workload operational burden.
Official references
Cilium Service Mesh , Cilium Ingress and Network Policy Example
Study Guide topic: Sidecar-based and sidecar-free service-mesh architectures.
22. Frage
What is an accurate description related to eBPF?
Antwort: B
Begründung:
Technical explanation
D is the accurate general description because eBPF programs can attach at kernel and application-related hook points where data may already be decrypted, depending on the program and the selected hook. The statement says "could," not that every packet-processing eBPF program automatically decrypts TLS. Cilium's documented TLS-aware inspection uses controlled TLS termination and a userspace Envoy proxy; the broader point is that eBPF is not restricted to observing encrypted wire-format packets at a single network interface.
The other choices are directly contradicted by Cilium's eBPF documentation. XDP and traffic-control programs can be replaced atomically at runtime without rebooting the host or restarting network services, so A is false. Traffic-control BPF supports both ingress and egress hook points, making B false. Cilium also applies eBPF-based security to the host through its Host Firewall and host-policy capabilities; therefore, eBPF security is not inherently confined to container traffic, and C is false.
A critical distinction is that inspecting application plaintext depends on where the program attaches and where encryption occurs. Cilium's ordinary L3/L4 datapath does not magically decrypt TLS, while its documented TLS interception workflow explicitly terminates and re-originates selected connections to expose application- layer content.
Official references
Cilium eBPF program types ; eBPF datapath introduction ; Inspecting TLS Encrypted Connections .
Study Guide topic: eBPF.
23. Frage
Among the definitions provided for the entities host, remote-node, cluster, and all, which description is accurate in the context of Cilium network policy?
Antwort: A
Begründung:
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.
24. Frage
What is a correct statement related to BIG TCP, an eBPF-based feature in Cilium?
Antwort: C
Begründung:
Technical explanation
BIG TCP permits the Linux networking stack to process packets larger than the traditional approximately 64- KiB limit represented by the IP length field while the packets remain inside the host. IPv6 BIG TCP uses a temporary Hop-by-Hop header carrying the larger internal length, while IPv4 BIG TCP sets tot_len to zero and uses the socket buffer length internally. Before transmission, packets are segmented into sizes suitable for the physical network. C therefore identifies the problem BIG TCP addresses.
Option A is false because Cilium's documentation explicitly states that BIG TCP does not require network- interface MTU changes. The larger objects exist inside the software networking stack and are segmented before appearing on the wire.
Option B reverses the intended performance effect. Larger internal GSO and GRO packets reduce repeated stack traversal, lowering CPU utilization and generally improving throughput and latency. Option D is also false: Generic Segmentation Offload and Generic Receive Offload are fundamental to BIG TCP's operation.
Cilium increases their maximum sizes when BIG TCP is enabled. The source mentions TSO, but the documented mechanism is principally described through GSO and GRO.
Official references
Cilium Performance Tuning and BIG TCP
Study Guide topic: BIG TCP, GSO/GRO, packet-length limits, and performance.
25. Frage
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