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Linux Foundation Cilium-Associate Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: eBPF	10%	- eBPF and iptables-Based Networking - eBPF Role and Benefits
Topic 2: Architecture	20%	- IP Address Management and Datapath Models - Cilium Architecture and Components
Topic 3: Service Mesh	16%	- Traffic Encryption and Service Mesh Architectures - Ingress and Gateway API
Topic 4: Installation and Configuration	10%	- Installation and Connectivity Testing - Cilium CLI and Configuration
Topic 5: Network Observability	10%	- Hubble CLI and UI - Hubble and Layer 7 Visibility
Topic 6: BGP and External Networking	6%	- Connecting Cilium Clusters to External Networks - Egress Connectivity
Topic 7: Network Policy	18%	- Policy Rules and Enforcement - Identity-Based Network Security
Topic 8: Cluster Mesh	10%	- Multi-Cluster Connectivity - Service Discovery and Load Balancing

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Linux Foundation Cilium Certified AssociateCCA Sample Questions (Q11-Q16):

NEW QUESTION # 11
What is an accurate description related to eBPF?

A. eBPF programs could inspect the decrypted contents of encrypted traffic.
B. eBPF program can only be attached in ingress (inbound from the network interface).
C. After eBPF programs have been loaded, the host needs rebooting before the functionality can be applied.
D. Network security tools based on eBPF can only police the containers' traffic as they are unable to access the host.

Answer: A

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 # 12
Which of the following best describes how eBPF is used within Cilium9

A. Cilium leverages eBPF to enforce network security policies at the kernel level. Security rules are translated into eBPF programs that are attached to kernel network hooks, allowing packet filtering based on these rules.
B. Cilium uses eBPF to provide a reliable and scalable DNS infrastructure for Kubernetes clusters, enabling seamless communication between services and facilitating service discovery within the cluster
C. Cilium utilizes eBPF to gather real-time insights Into network traffic, Including data on latency, bandwidth, and data flows between services. This data Is exposed through a user interface and can be used for network troubleshooting and optimization.
D. Cilium is a security-related project that utilizes eBPF for real-time network security analysis. It employs eBPF to detect and respond to network security threats by inspecting network traffic.

Answer: A

Explanation:
Technical explanation
D most precisely describes Cilium's foundational use of eBPF. The Cilium agent translates desired networking and security state into eBPF programs and maps, then attaches those programs to Linux kernel hook points such as traffic-control ingress and egress, XDP, cgroups, and sockets. Packets can consequently be classified, permitted, dropped, redirected, load-balanced, or forwarded without requiring changes to the protected application.
Endpoint-policy programs associate traffic with Cilium security identities and perform Layer 3 and Layer 4 enforcement in the kernel. Traffic requiring Layer 7 inspection can be redirected from the eBPF datapath to Envoy. This combination provides efficient kernel-level enforcement while retaining application-aware controls.
Option A describes an important Hubble observability outcome, but it is narrower than Cilium's primary networking and enforcement model and overstates what is necessarily exposed through a UI. Option B mischaracterizes Cilium as DNS infrastructure; Cilium can enforce DNS-aware policies but does not replace Kubernetes DNS service discovery. Option C is too generic and implies a conventional threat-detection product rather than identity-based networking and policy enforcement.
Official references
Cilium eBPF Datapath Introduction , Introduction to Cilium and Hubble
Study Guide topic: Kernel hooks, endpoint policy, identities, and eBPF datapath enforcement.

NEW QUESTION # 13
What is true about WireGuard encryption on Cilium?

A. It provides encryption for node-to-node, pod-to-node, node-to-pod, and pop-to-pod traffic as long as the pods are on different nodes.
B. When WireGuard is enabled in Cilium, each pod will establish a secure WireGuard tunnel between it and all other known pods in the cluster.
C. Packets are encrypted when they are destined to the same node from which they were sent. This is to ensure confidentiality of traffic within the node.
D. When running in the tunneling mode, pod-to-pod traffic will be sent over the WireGuard tunnel before being transmitted over the overlay tunnel.

Answer: A

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 # 14
What is true about Layer 7 protocol visibility in Cilium?

A. It supports any Layer 7 protocols, including SSH, Telnet and FTP.
B. DNS visibility in available in the ingress direction only.
C. It can be enabled by deploying a standard Kubernetes network policy.
D. It results in traffic being proxied through an Envoy instance.

Answer: D

Explanation:
Technical explanation
Layer 7 protocol visibility redirects traffic matching the relevant L7 rules to Cilium's node-local proxy, which is Envoy. Envoy parses supported application protocols and supplies the resulting request or response metadata to Cilium's observability pipeline. Therefore, C correctly identifies the architectural consequence of enabling this visibility.
The feature requires L7 proxy support and an appropriate CiliumNetworkPolicy containing Layer 7 rules. A standard Kubernetes NetworkPolicy is limited to Layer 3 and Layer 4 concepts and cannot express Cilium's HTTP, DNS, or generic application-protocol rules, so B is incorrect.
A is also incorrect. DNS policy and visibility are commonly applied to pod egress queries, and Cilium's model is not restricted to ingress-only DNS visibility. D overstates protocol coverage. Cilium supports defined L7 parsers and policy types-most prominently HTTP, DNS, Kafka, and supported generic Envoy- based protocols-but it does not promise arbitrary visibility for every application protocol. SSH, Telnet, and FTP cannot simply be assumed to receive native semantic parsing.
An operational caveat is that L7 visibility rules also affect policy enforcement: they are not merely passive packet logging instructions.
Official references
Layer 7 Protocol Visibility , Cilium Envoy
Study Guide topic: L7 proxy redirection, CiliumNetworkPolicy, protocol parsing, and Hubble visibility.

NEW QUESTION # 15
Which Cilium command should you execute to gather network-related troubleshooting information from your Kubernetes cluster?

A. cilium sysduwp
B. cilium status --verbose
C. cilium bugtool
D. cilium debuginfo

Answer: A

NEW QUESTION # 16
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