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Linux Foundation Cilium-Associate Exam Syllabus Topics:

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

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Linux Foundation Cilium Certified AssociateCCA Sample Questions (Q18-Q23):

NEW QUESTION # 18
After enabling Layer 7 visibility, you can now observe DNS domains and FQDN in your Hubble logs, like the one below.
Nov 16 13:52:07.279: endor/xwing-9bd8f454d-m46mm:34706 (ID:3817) < > example.com:443 (ID:
16777217) Policy denied DROPPED (TCP Flags SYN)
Which of these Hubble CLI commands could have returned the output above?

A. hubble observe --to-fqdn example.con --from-namespace endor --to-port 443 --verdict DROPPED
B. hubble obs erve --to-fqdn example.con --fro # -namespace endor --to-port 80 --verdict DROPPED
C. hubble observe --to-fqdn example.co* --from-namespace endor --to-port 443 --verdict FORWARDED
D. hubble observe --to-fqdn example.cow --from-namespace kube-system --to-port 443 --verdict DROPPED

Answer: A

Explanation:
Technical explanation
A is clearly the intended answer because its filters correspond to the displayed source namespace ( endor ), destination port ( 443 ), and verdict ( DROPPED ). However, it contains example.con , whereas the observed flow names example.com . Therefore, none of the options would literally return this exact flow if the FQDN filter is matched as written. The corrected command is:
hubble observe --to-fqdn example.com --from-namespace endor --to-port 443 --verdict DROPPED Option B is malformed in two additional places and filters port 80 rather than 443. Option C selects the wrong FQDN and source namespace. Option D requests forwarded flows, directly contradicting the Policy denied DROPPED verdict; its wildcard also does not repair the verdict mismatch.
Hubble's observe filters are cumulative: a returned flow must satisfy the specified destination FQDN, originating namespace, destination port, and verdict. Layer 7 visibility is enabled with a Cilium network policy containing the relevant L7 rules, which redirects selected traffic through the proxy so that application- level details can be reported.
Official references
Inspecting Network Flows with the Hubble CLI , Layer 7 Protocol Visibility Study Guide topic: Hubble flow filtering, FQDN visibility, namespaces, ports, and verdicts.

NEW QUESTION # 19
You need to expose an application over HTTPS on your Cilium-managed Kubernetes cluster The security team has specifically asked for traffic to be encrypted all the way from the external clients to the Service.
Which option should you use?

A. Enable the Gateway API feature and use the TLS Passthrough mode and TLSRoute route type.
B. Enable the Ingress feature and use the TLS Terminate mode and HTTPRoute route type.
C. Enable the Gateway API feature and use the TLS Terminate mode and HTTPRoute route type.
D. Enable the Ingress feature and use the TLS Passthrough mode and TLSRoute route type.

Answer: A

Explanation:
Technical explanation
The requirement is that traffic remain encrypted all the way from the external client to the backend Service .
Therefore, TLS must not terminate at the Cilium Gateway/Envoy proxy .
With TLS Passthrough , Cilium forwards the encrypted TLS stream to the backend without decrypting the application traffic. Envoy can inspect the TLS ClientHello/SNI sufficiently to select the appropriate backend, but the TLS session itself continues to the Service. Cilium specifically supports TLS passthrough with the Gateway API TLSRoute resource .
By contrast, TLS Terminate + HTTPRoute decrypts the connection at the Gateway. Although a separate encrypted connection to the backend can be configured in some architectures, that is not the same as preserving the original end-to-end TLS session requested here. Cilium's HTTPS Gateway examples use TLS termination when the Gateway itself handles the certificate.
Study Guide topic: Service Mesh.

NEW QUESTION # 20
Which of the following best describes how eBPF is used within Cilium9

A. 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
B. 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.
C. 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.
D. 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.

Answer: D

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 # 21
What does this Egress Gateway policy achieve?

Cilium Egress Gateway policy exhibit

A. It would cause all traffic sent to pods with the org: empire and class: mediabot labels in the default namespace and destined to 192.168.10.0/24 to be routed through the gateway node with the node.
kubernetes.io/name: egress-node label, which will then SNAT said traffic with the 10.168.60.180 egress IP
B. It would cause all traffic originating from pods with the org: empire and class: nediabot labels in the default namespace and destined to 192.168.19.0/24 to be routed through the gateway node with the node.kubernetes.io/name: egress-node label, which will then DN AT said traffic with the 10.168.60.100 egress IP
C. It would cause all traffic sent to pods with the org: empire and class: mediabot labels In the default namespace and destined to 192.168.19.9/24 to be routed through the gateway node with the node.
kubemetes.io/name: egress-node label, which will then DNAT said traffic with the 19.168.69.199 egress IP
D. It would cause all traffic originating from pods with the org: empire and class: mediabot labels in the default namespace and destined to 192.168.19.0/24 to be routed through the gateway node with the node.kubemetes.io/name: egress-node label, which will then SNAT said traffic with the 10.168.60.100 egress IP

Answer: D

Explanation:
Cilium's official documentation confirms that a CiliumEgressGatewayPolicy selects traffic originating from matching pods , routes traffic destined for the configured destinationCIDRs through the selected egress gateway node, and SNATs that traffic using the configured egressIP.

NEW QUESTION # 22
Review the Cilium Network Policy in the YAML file.
It was deployed in the ns-cca namespace on cluster1

Cluster Mesh CiliumNetworkPolicy exhibit
Which statement Is correct?

A. This policy will deny traffic from a Pod named ship in ns-cca namespace in clusterl to a Pod named base in default namespace in cluster2.
B. This policy will allow traffic from a Pod named ship in ns-cca namespace in clusterl to a Pod named base in default namespace in cluster2.
C. This policy will deny traffic from a Pod named ship in ns-cca namespace in clusterl to a Pod named base in ns-cca namespace in cluster2.
D. This policy will allow traffic from a Pod named ship in ns-cca namespace in clusterl to a Pod named base in ns-cca namespace in cluster2.

Answer: D

Explanation:
Technical explanation
The policy's endpointSelector selects the ship workload in the namespace containing the CiliumNetworkPolicy , which is ns-cca . It also explicitly includes io.cilium.k8s.policy.cluster: cluster1 , confirming that the selected source endpoint belongs to cluster1.
The egress rule authorizes communication to an endpoint carrying name: base and the cluster label io.cilium.
k8s.policy.cluster: cluster2 . Because the namespaced policy does not specify a different destination namespace through k8s:io.kubernetes.pod.namespace , the intended destination is the corresponding base workload in ns-cca on cluster2. Therefore, A matches the policy.
Options C and D incorrectly describe the rule as a deny rule. Cilium policy rules use an allow-list model unless an explicit egressDeny or ingressDeny section is present. The exhibit contains an ordinary egress rule, so matching traffic is authorized. Option B incorrectly places the destination in default .
Current Cilium versions require explicit cluster targeting for remote endpoints, which this policy provides through the cluster label.
Official references
Cluster Mesh Network Policy , Namespaces in Cilium Policy
Study Guide topic: Cluster Mesh labels, namespaced policies, and cross-cluster endpoint selection.

NEW QUESTION # 23
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