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Linux Foundation Cilium-Associate Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: eBPF10%- Understand the Role of eBPF in Cilium
  • 1. eBPF-based Platforms versus IPTables-based Platforms
    • 2. eBPF Key Benefits
      Topic 2: Network Policy18%- Interpret Cilium Network Policies and Intent
      • 1. Understand Cilium's Identity-based Network Security Model
        • 2. Policy Enforcement Modes
          • 3. Kubernetes Network Policies versus Cilium Network Policies
            • 4. Policy Rule Structure
              Topic 3: Network Observability10%- Understand the Observability Capabilities of Hubble
              • 1. Enabling Layer 7 Protocol Visibility
                • 2. Know How to Use Hubble from the Command Line or the Hubble UI
                  Topic 4: Cluster Mesh10%- Understand the Benefits of Cluster Mesh for Multi-cluster Connectivity
                  • 1. Achieve Service Discovery and Load Balancing Across Clusters with Cluster Mesh
                    Topic 5: Installation and Configuration10%- Know How to Use Cilium CLI to Query and Modify the Configuration
                    • 1. Using Cilium CLI to Install Cilium, Run Connectivity Tests, and Monitor its Status
                      Topic 6: Architecture20%- Understand the Role of Cilium in Kubernetes Environments
                      • 1. IP Address Management (IPAM) with Cilium
                        • 2. Datapath Models
                          • 3. Cilium Architecture
                            • 4. Cilium Component Roles
                              Topic 7: BGP and External Networking6%- Egress Connectivity Requirements
                              • 1. Understand Options to Connect Cilium-managed Clusters with External Networks
                                Topic 8: Service Mesh16%- Know How to use Ingress or Gateway API for Ingress Routing
                                • 1. Sidecar-based versus Sidecarless Architectures
                                  • 2. Service Mesh Use Cases
                                    • 3. Encrypting Traffic in Transit with Cilium
                                      • 4. Understand the Benefits of Gateway API over Ingress

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                                        Linux Foundation Cilium Certified AssociateCCA Sample Questions (Q12-Q17):

                                        NEW QUESTION # 12
                                        What is true about Layer 7 protocol visibility in Cilium?

                                        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 # 13
                                        What is the issue with the following egress gateway manifest specification?

                                        Egress gateway manifest exhibit

                                        Answer: A

                                        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 # 14
                                        Which statement about Cilium's identity-based security model is correct?

                                        Answer: D

                                        Explanation:
                                        Technical explanation
                                        Cilium derives a workload's security identity from its security-relevant labels. Network policies then refer to workload characteristics such as application, role, environment, namespace, or service account rather than depending exclusively on transient pod IP addresses. The identity is associated with traffic in the Cilium datapath and validated when policy is enforced. This makes B the accurate description.
                                        The identity is not limited to a single pod. Endpoints that have the same set of identity-relevant labels can share the same numeric security identity, including endpoints located on different cluster nodes. This reduces policy-map growth and allows policy to scale with logical application groups rather than with the number of pod addresses. Namespace information is normally among the labels used to derive identity, but that does not make an identity inherently "tied to a single namespace" as option A states.
                                        Options C and D invert Cilium's design. IP addresses remain necessary for packet delivery, but they are not the primary security identifier for Cilium-managed workloads. Pods can be recreated and assigned new addresses while retaining the same relevant labels and therefore the same security intent. Decoupling identity from addressing is precisely what improves scalability and operational stability.
                                        Official references
                                        Cilium Terminology and Identity ; Introduction to Cilium and Hubble .
                                        Study Guide topic: Architecture.


                                        NEW QUESTION # 15
                                        Which encapsulation protocols are supported when configuring Cilium in tunnel mode?

                                        Answer: C

                                        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 # 16
                                        When using Cilium with the kube-proxy replacement enabled, which underlying technology is effectively replaced with eBPF?

                                        Answer: B

                                        Explanation:
                                        Technical explanation
                                        Kubernetes kube-proxy conventionally implements Service translation and load balancing through either iptables or IPVS. With Cilium's kube-proxy replacement enabled, eBPF programs and maps perform Kubernetes Service handling directly in the kernel, including ClusterIP, NodePort, LoadBalancer, ExternalIP, and related service translation functions. C is therefore correct.
                                        The replacement can operate at socket hooks and packet-processing hooks. Service and backend information is stored in eBPF maps, allowing the datapath to select backends and perform address translation without traversing the kube-proxy-generated iptables or IPVS rules normally used for Kubernetes Services.
                                        BGP is not replaced. Cilium's BGP Control Plane is a separate feature used to advertise routes and service addresses to external routers. Routing itself is also not eliminated; Cilium can implement and accelerate routing decisions with eBPF, but packets still require a valid forwarding model. firewalld is a host firewall- management service and is not the underlying Kubernetes Service implementation replaced by kube-proxy replacement.
                                        Relevant installations must satisfy the kernel and device requirements for Cilium's eBPF service load- balancer functionality.
                                        Official references
                                        Kubernetes Without kube-proxy
                                        Study Guide topic: kube-proxy replacement, eBPF service maps, iptables, and IPVS.


                                        NEW QUESTION # 17
                                        ......

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