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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Cluster Mesh | 10% | - Multi-Cluster Connectivity - Service Discovery and Load Balancing |
| Topic 2: Architecture | 20% | - Cilium Architecture and Components - IP Address Management and Datapath Models |
| Topic 3: eBPF | 10% | - eBPF and iptables-Based Networking - eBPF Role and Benefits |
| Topic 4: Network Policy | 18% | - Policy Rules and Enforcement - Identity-Based Network Security |
| Topic 5: Service Mesh | 16% | - Ingress and Gateway API - Traffic Encryption and Service Mesh Architectures |
| Topic 6: Network Observability | 10% | - Hubble CLI and UI - Hubble and Layer 7 Visibility |
| Topic 7: BGP and External Networking | 6% | - Egress Connectivity - Connecting Cilium Clusters to External Networks |
| Topic 8: Installation and Configuration | 10% | - Cilium CLI and Configuration - Installation and Connectivity Testing |
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NEW QUESTION # 34
What is the correct statement about the masquerading feature?
Answer: B
Explanation:
Technical explanation
Masquerading performs source network address translation for qualifying traffic that leaves the cluster.
Because pod addresses are often private and not routable by the external network, Cilium replaces the pod's source address with an address belonging to the egress node. Return traffic can then reach that node, which reverses the translation and delivers the response to the originating pod. B correctly summarizes this behavior.
Masquerading is a form of SNAT, not DNAT. DNAT modifies the destination address, commonly to direct incoming traffic toward another endpoint, so C is incorrect.
Cilium documents its eBPF-based masquerading implementation as the more efficient implementation. The iptables version is the legacy alternative, making A false. Conversely, eBPF masquerading depends on appropriate kernel eBPF capabilities and Cilium's BPF NodePort functionality. It cannot be assumed to work on every kernel version, so D is false. The legacy iptables implementation is the mode documented as broadly working across kernel versions.
Cilium can exclude natively routable CIDRs from masquerading, and administrators may configure separate IPv4 and IPv6 masquerading behavior.
Official references
Cilium Masquerading , Cilium System Requirements
Study Guide topic: SNAT, native-routing exclusions, and eBPF versus iptables masquerading.
NEW QUESTION # 35
What is the purpose of the 12 Announcements" feature?
Answer: A
Explanation:
Technical explanation
The question's "12 Announcements" wording is a source transcription error for L2 Announcements . This feature makes Kubernetes Services visible and reachable to clients on the local Layer 2 network, particularly in on-premises, office, campus, or bare-metal environments that do not use BGP-based service advertisement.
Cilium responds to ARP requests for IPv4 Service addresses and NDP requests for IPv6 addresses. A selected node advertises the LoadBalancer IP or ExternalIP using its MAC address and receives traffic for that virtual IP. Cilium then applies its service load-balancing functionality to forward the connection to an appropriate backend. Leadership is coordinated so that one node advertises a given Service at a time, and the virtual IP can move to another eligible node after failure.
The feature is not intended to provide general Layer 2 multicast, making A incorrect. DNS service discovery is handled through Kubernetes DNS and is independent of L2 announcements, eliminating C. It also does not define Layer 2 security policies, so D is incorrect.
Thus, the purpose is external Service reachability on the local area network, exactly as described by B.
Official references
L2 Announcements .
Study Guide topic: BGP and External Networking.
NEW QUESTION # 36
Which command is used to enable logging at the debug log level of Cilium agents7
Answer: C
Explanation:
Technical explanation
cilium config set debug true follows the supported Cilium CLI configuration syntax and sets the debug configuration key to true . The cilium config set command accepts a key/value pair and, by default, restarts the Cilium pods so that the changed configuration is applied. The Cilium configuration documentation defines debug as the setting that enables full debug mode. This increases agent logging verbosity and causes eBPF programs to emit additional visibility events for diagnostic use.
Options A, B, and D do not match documented Cilium CLI command structures. There is no cilium log level
--set=debug command in the Cilium CLI hierarchy, and neither cilium logging.level=debug nor cilium logging debug is valid configuration syntax. A Helm-managed installation may also enable debugging through the chart value debug.enabled=true , but that does not make any of the alternative commands correct.
Debug mode should be enabled deliberately because it increases log volume and may generate additional datapath visibility information. After troubleshooting, operators should normally restore the previous setting to avoid unnecessary operational overhead.
The supplied answer key incorrectly identifies B. The verified answer is C.
Official references
Cilium configuration ; Cilium CLI `config set` ; Helm values .
Study Guide topic: Installation and Configuration.
NEW QUESTION # 37
Which affirmation is true about eBPF host-routing?
Answer: C
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 # 38
The Cilium Agent is deployed as part of the Cilium installation. What of the following is true about the Cilium Agent?
Answer: A
Explanation:
Technical explanation
For every pod managed by Cilium, the responsible node-local Cilium agent creates a CiliumEndpoint object with the same name and namespace. The object exposes endpoint state such as labels, the allocated security identity, addressing information, and effective policy. The agents also create endpoint objects for their inter- agent health endpoints. B is therefore correct.
The other responsibilities belong primarily to the Cilium Operator. The operator normally registers Cilium's CustomResourceDefinitions, manages addresses for LoadBalancer Services when LB IPAM is active, and performs configured cluster-wide synchronization or shared-state operations. It also garbage-collects orphaned CiliumEndpoint resources when their associated pods no longer exist or have permanently completed.
The Cilium agent itself runs on each node. It responds to workload lifecycle events, creates and manages local endpoints, loads eBPF programs, applies policies, and maintains the node's datapath. This division ensures that latency-sensitive forwarding and endpoint operations remain node-local while logically cluster-wide activities are consolidated in the operator.
Official references
CiliumEndpoint CRD , Cilium Operator Responsibilities
Study Guide topic: Cilium agent, Cilium Operator, and CiliumEndpoint lifecycle.
NEW QUESTION # 39
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