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| Section | Weight | Objectives |
|---|---|---|
| Installation and Configuration | 10% | - Know How to Use Cilium CLI to Query and Modify the Configuration
|
| Service Mesh | 16% | - Know How to use Ingress or Gateway API for Ingress Routing
|
| eBPF | 10% | - Understand the Role of eBPF in Cilium
|
| Cluster Mesh | 10% | - Understand the Benefits of Cluster Mesh for Multi-cluster Connectivity
|
| Network Observability | 10% | - Understand the Observability Capabilities of Hubble
|
| BGP and External Networking | 6% | - Egress Connectivity Requirements
|
| Architecture | 20% | - Understand the Role of Cilium in Kubernetes Environments
|
| Network Policy | 18% | - Interpret Cilium Network Policies and Intent
|
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NEW QUESTION # 48
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?
Answer: A
Explanation:
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.
NEW QUESTION # 49
In which use case can the Cilium Service Mesh exclusively utilize eBPF without requiring a proxy such as Envoy?
Answer: C
Explanation:
Technical explanation
Cilium can implement Layer 3 and Layer 4 forwarding exclusively through its eBPF datapath. IP, TCP, and UDP traffic can be routed, load-balanced, filtered, and redirected through eBPF programs attached to Linux networking hooks. These operations depend on network-layer addresses, protocols, ports, identities, and connection state; they do not require application-protocol parsing by a userspace proxy.
Application-layer operations are different. Cilium's official Service Mesh architecture uses a proxy such as Envoy to parse HTTP, gRPC, and DNS when Layer 7 policy, observability, or traffic management requires understanding individual requests. The eBPF datapath transparently redirects selected traffic to the node-local proxy and retains identity context, while Envoy performs the protocol-aware operation.
Kafka parsing is also an application-layer activity rather than ordinary Layer 3 or Layer 4 forwarding.
Moreover, current Cilium releases removed the former Envoy Go extension mechanism used for Kafka and generic proxylib rules, further reinforcing that it is not an eBPF-only forwarding case.
Therefore, D accurately identifies the scenario in which the Service Mesh datapath can remain entirely in the kernel without requiring Envoy.
Official references
Cilium Service Mesh ; eBPF Datapath Introduction .
Study Guide topic: Service Mesh.
NEW QUESTION # 50
You are tasked to install Cilium and enable transparent encryption in a cluster in which the following conditions applies:
# Internal cluster traffic is IPv6-only
# The current cluster is running on 5001 nodes
# The cluster is planned to connect to another cluster which has 5001 nodes through Cluster Mesh What are your recommendations regarding transparent encryption?
Answer: B
Explanation:
Technical explanation
A is a supported recommendation: Cilium's WireGuard implementation provides transparent encryption between Cilium-managed endpoints, works with Cluster Mesh, and distributes node public keys to remote clusters through clustermesh-apiserver . All participating clusters must enable WireGuard, and inter-cluster firewalls must permit UDP port 51871. IPv6-only pod traffic does not inherently disqualify WireGuard.
However, this question is no longer uniquely answerable from current Cilium documentation. Current IPsec documentation supports IPv6 pod-to-pod connectivity and sets its cluster or Cluster Mesh limit at more than
65,535 nodes. The described mesh contains 10,002 nodes, so option B is also technically supportable under the stated facts. The older distinction apparently assumed by the supplied key is no longer sufficient to exclude IPsec.
Options C and D are definitively false. Ten thousand and two nodes remain below the documented IPsec ceiling, and transparent encryption is not restricted to IPv4. WireGuard may still be selected for its automatic per-node key-pair distribution and simpler Cluster Mesh integration, but workload performance, kernel support, firewall rules, key-management requirements, and operational testing should inform a production recommendation.
Official references
WireGuard Transparent Encryption , IPsec Transparent Encryption
Study Guide topic: Transparent-encryption selection, IPv6, Cluster Mesh, and scaling limits.
NEW QUESTION # 51
What is the issue with the following egress gateway manifest specification?
Egress gateway manifest exhibit
Answer: B
Explanation:
Technical explanation
The manifest specifies both interface: net1 and egressIP: 10.3.4.5 in the same egressGateway configuration.
These properties are mutually exclusive. Cilium ignores an Egress Gateway policy containing both, so A correctly identifies the defect.
When interface is supplied, Cilium uses the selected interface and chooses its first suitable IPv4 and IPv6 addresses as the SNAT addresses. When egressIP is supplied, that address must already be assigned to a network device on the chosen gateway node; Cilium determines the corresponding interface through a route lookup. Administrators may also omit both fields, causing Cilium to select the default-route interface and its addresses.
Option B is incorrect because matchLabels can contain multiple label key-value pairs, as the exhibit does with app: blog and component: backend . Option C is false because the egress address need not be publicly routable; private addresses are valid when routing and upstream network design support them. Option D is false because Cilium does not restrict gateway interfaces to names beginning with eth .
Official references
Cilium Egress Gateway
Study Guide topic: Egress Gateway node selection, interface selection, and SNAT addresses.
NEW QUESTION # 52
Which encapsulation protocols are supported when configuring Cilium in tunnel mode?
Answer: B
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 # 53
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