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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Policy | 18% | - Interpret Cilium Network Policies and Intent
|
| Topic 2: Network Observability | 10% | - Understand the Observability Capabilities of Hubble
|
| Topic 3: BGP and External Networking | 6% | - Egress Connectivity Requirements
|
| Topic 4: eBPF | 10% | - Understand the Role of eBPF in Cilium
|
| Topic 5: Cluster Mesh | 10% | - Understand the Benefits of Cluster Mesh for Multi-cluster Connectivity
|
| Topic 6: Architecture | 20% | - Understand the Role of Cilium in Kubernetes Environments
|
| Topic 7: Installation and Configuration | 10% | - Know How to Use Cilium CLI to Query and Modify the Configuration
|
| Topic 8: Service Mesh | 16% | - Know How to use Ingress or Gateway API for Ingress Routing
|
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NEW QUESTION # 13
Which affirmation is true about eBPF host-routing?
Answer: B
Explanation:
Technical explanation
C accurately describes eBPF host-routing. In a conventional datapath, packets may traverse substantial portions of the host networking stack and its iptables hooks even when Cilium performs routing decisions with eBPF. eBPF host-routing takes a more direct datapath, bypassing iptables and the upper host stack while providing a faster transition between the host and pod network namespaces. This reduces processing and context-switching overhead and can improve throughput and latency.
Option A describes load-balancing behavior rather than host routing. Backend distribution is implemented through Cilium's service load-balancer maps and algorithms. Host routing can improve the path used by resulting packets, but it does not itself guarantee even backend selection.
Option B is the description of BIG TCP. BIG TCP increases the size of internal GSO and GRO packets to reduce stack traversal. Although BIG TCP requires eBPF host-routing in supported Cilium configurations, the two are distinct features.
Option D is overly specific and does not define the feature. Host routing optimizes compatible pod traffic generally, subject to kernel, kube-proxy-replacement, masquerading, netfilter, encryption, and integration constraints.
Official references
Cilium eBPF Host-Routing
Study Guide topic: eBPF host-routing, host-stack bypass, veth traversal, and performance.
NEW QUESTION # 14
What is true about WireGuard encryption on Cilium?
Answer: D
Explanation:
Technical explanation
B is the best answer, with two qualifications. First, "pop-to-pod" is evidently a source typo for "pod-to-pod." Second, default WireGuard mode encrypts traffic between Cilium-managed pods on different nodes; node-to- node, pod-to-node, and node-to-pod coverage requires enabling the additional encryption.
nodeEncryption=true mode.
Cilium creates WireGuard peers per node, not per pod. Each Cilium agent generates a node key pair, advertises the public key through its CiliumNode resource, and forms secure tunnels with other known nodes.
This makes D incorrect. Same-node packets do not traverse a WireGuard tunnel because encryption cannot protect them from an observer already able to inspect raw traffic on that host, so A reverses the documented behavior.
C also reverses the encapsulation sequence. In tunnel-routing mode, pod traffic is first encapsulated for the VXLAN or Geneve overlay and is then encapsulated by WireGuard. The result is double encapsulation, with WireGuard protecting the overlay packet while it crosses the network between nodes.
Thus, B describes WireGuard's supported traffic coverage most closely, but exam candidates should remember the separate node-encryption configuration requirement.
Official references
WireGuard Transparent Encryption
Study Guide topic: WireGuard peer architecture, encrypted traffic matrix, same-node behavior, and encapsulation order.
NEW QUESTION # 15
What is an accurate description related to eBPF?
Answer: B
Explanation:
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.
NEW QUESTION # 16
Which proxy does Cilium use to enforce HTTP and other Layer 7 (L7) policies specified in network policies for the cluster?
Answer: B
Explanation:
Technical explanation
Cilium uses Envoy as its userspace Layer 7 proxy. When a Cilium policy contains HTTP or another supported application-layer rule, Cilium's eBPF datapath identifies matching traffic and redirects it to a node-local Envoy instance. Envoy evaluates the application-layer attributes-such as HTTP method, path, or headers- against the generated policy configuration and then forwards or rejects the request.
The proxy can operate in embedded mode as a separate process inside the Cilium agent pod or as the independently life-cycled cilium-envoy DaemonSet. Both deployment forms use Cilium's optimized Envoy distribution and custom policy-enforcement filters. Communication between the agent and Envoy uses local UNIX-domain sockets for configuration, access logs, and administrative operations.
HAProxy is a capable general-purpose load balancer, but it is not Cilium's L7 policy proxy. Squid primarily serves forward and caching proxy use cases. linkerd2-proxy belongs to the Linkerd service mesh and is not used by Cilium for network-policy enforcement. Consequently, only D identifies the proxy integrated into Cilium's L7 datapath.
Official references
Cilium Envoy , Cilium eBPF Datapath Introduction
Study Guide topic: Envoy proxy integration and Layer 7 policy enforcement.
NEW QUESTION # 17
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: A
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 # 18
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