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| Section | Weight | Objectives |
|---|---|---|
| eBPF | 10% | - eBPF-based networking, security, and observability - eBPF fundamentals and relevance to Cilium |
| Service Mesh | 16% | - Transparent traffic encryption - Sidecar vs sidecarless architecture - Ingress and Gateway API integration |
| Architecture | 20% | - Cilium core architecture and components - CNI integration and kube-proxy replacement |
| BGP and External Networking | 6% | - External gateway integration - BGP peering and service advertisement |
| Network Policy | 18% | - Cilium vs Kubernetes network policies - Policy enforcement modes - Identity-aware and L3–L7 policy models |
| Network Observability | 10% | - Hubble architecture and CLI usage - Hubble UI and troubleshooting basics - Layer 7 visibility and flow monitoring |
| Installation and Configuration | 10% | - Deployment methods (Helm, cilium-cli) - Post-install validation and connectivity testing |
| Cluster Mesh | 10% | - Multi-cluster connectivity and service discovery - Cross-cluster load balancing and failover |
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NEW QUESTION # 47
How does Cilium primarily improve security in Kubernetes clusters?
Answer: B
Explanation:
Technical explanation
Cilium primarily improves Kubernetes network security through identity-aware policy enforcement across Layers 3 through 7. Standard Kubernetes NetworkPolicy resources provide Layer 3 and Layer 4 controls, while CiliumNetworkPolicy extends enforcement to application-layer rules. Policies can select workloads by labels and identity, restrict protocols and destination ports, control communication with CIDRs or entities, apply DNS/FQDN rules, and authorize supported HTTP or gRPC operations. This multi-layer enforcement is the capability described by D.
API Gateway and Gateway API configurations can contribute to controlling north-south traffic, but they are not Cilium's primary or comprehensive security mechanism. Database encryption is implemented by database, storage, or encryption-management systems rather than being a general function of Cilium.
Persistent-volume backup is similarly outside Cilium's CNI, network-policy, and observability responsibilities.
Cilium's identity model is especially important in dynamic Kubernetes environments. Security policy follows workload identities derived from labels instead of depending exclusively on changing pod IP addresses. At Layer 7, traffic is redirected to Envoy when protocol-aware inspection or enforcement is required, while eBPF supplies the efficient kernel datapath for lower-layer processing.
Official references
Introduction to Cilium and Hubble ; Network Policy ; Layer 7 Policies .
Study Guide topic: Network Policy.
NEW QUESTION # 48
You are creating a Cilium network policy for pods with the label app: frontend . The policy should allow all pods with that label to communicate with destinations inside 192.168.e.e/24 and using TCP on port 8888.
For example:
# Traffic to 192.168.9.23:8888 should be allowed
# Traffic to 192.168.10.5:8888 should be denied.
# Traffic to 192.168.9.12:5606 should be denied.
Which of the following policies is correct?
A)
Option A
B)
Option B
C)
Option C
D)
Option D
Answer: D
Explanation:
Technical explanation
Option C has the correct Cilium policy structure. It selects pods labeled app: frontend , creates an egress rule with a valid CIDR entry, and combines that destination constraint with toPorts , port 8888 , and protocol TCP
. Because the CIDR and port restriction are in the same egress rule, traffic must meet both conditions.
Option A uses an unsupported address-range structure with from and to fields rather than CIDR notation.
Option B initially resembles the correct form but contains an additional malformed ports item at the egress- rule level. Option D uses unsupported action: allow and action: deny fields inside toPorts ; Cilium allow and deny behavior is expressed through policy sections such as egress and egressDeny , not per-port action properties.
The item is nevertheless defective. The prose and examples indicate 192.168.9.0/24 , while all displayed CIDR-based options specify 192.168.0.0/24 ; the source text itself shows the corrupted 192.168.e.e/24 . If
192.168.9.0/24 is authoritative, none of the exhibits permits the stated example. The supplied key B is structurally incorrect under the displayed manifests.
Official references
Cilium Layer 3 and CIDR Policies
Study Guide topic: CIDR selectors, Layer 4 ports, and rule composition.
NEW QUESTION # 49
The application team would like to observe egress traffic with application level information for workloads running in a Cilium based Kubernetes Cluster Which features would offer this without the need for additional tooling?
Answer: C
Explanation:
Technical explanation
Hubble UI and Hubble CLI are Cilium's integrated interfaces for examining workload network flows. Hubble records source and destination identities, namespaces, workloads, addresses, ports, forwarding verdicts, and drop reasons. When Layer 7 visibility is configured, its flow output can also contain application-level information such as HTTP methods, URLs, response codes, latency, and DNS queries. Filters can narrow the results by source workload, namespace, destination, protocol, port, or verdict, making Hubble appropriate for investigating egress behavior.
Hubble CLI provides detailed event-oriented inspection, while Hubble UI presents flows and service dependencies graphically. Hubble Relay aggregates the per-node Hubble APIs so these clients can obtain cluster-wide visibility.
Load balancing directs traffic but is not an observability interface. Kubernetes NetworkPolicy expresses permitted communications but does not by itself display application-level flow records. Fluentd and Grafana are external logging and visualization components and would violate the requirement to avoid additional tooling.
Layer 7 information requires supported traffic to be redirected through Cilium's L7 proxy. Hubble then exposes the resulting application-layer flow events through the built-in CLI or UI, making D the complete answer.
Official references
Network Observability with Hubble ; Inspecting Network Flows .
Study Guide topic: Network Observability.
NEW QUESTION # 50
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?
Answer: C
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 # 51
Which component, when available, is able to handle IPAM requests?
Answer: B
Explanation:
Technical explanation
The Cilium Operator handles IP address management responsibilities in IPAM modes that require cluster- wide or cloud-integrated allocation. Current documentation identifies the operator as responsible for IPAM in Azure IPAM, AWS ENI, and cluster-scope mode. Cloud-specific operators populate the appropriate allocation information in CiliumNode resources, after which node-local agents allocate addresses to endpoints from the available ranges.
The phrase "when available" is important because responsibilities vary by IPAM mode. Under Kubernetes host-scope IPAM, Kubernetes allocates each node's PodCIDR, and the Cilium agent consumes that range from the Kubernetes Node object. Nevertheless, among the supplied components, the operator is the component specifically associated with centralized IPAM requests and allocation management.
The Cilium agent implements each node's datapath and endpoint lifecycle but is not the general cluster-wide IPAM answer intended here. Cilium API Server is not the documented allocation component. The misspelled Cilium CNIPIugin refers to the CNI plugin, which requests networking setup when a pod is created but does not replace the operator's IPAM responsibilities.
Official references
Cilium Operator , Cilium IP Address Management
Study Guide topic: Cilium Operator responsibilities and IPAM modes.
NEW QUESTION # 52
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