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| Section | Weight | Objectives |
|---|---|---|
| Service Mesh | 16% | - Traffic Encryption and Service Mesh Architectures - Ingress and Gateway API |
| Network Policy | 18% | - Identity-Based Network Security - Policy Rules and Enforcement |
| eBPF | 10% | - eBPF and iptables-Based Networking - eBPF Role and Benefits |
| Architecture | 20% | - Cilium Architecture and Components - IP Address Management and Datapath Models |
| Cluster Mesh | 10% | - Service Discovery and Load Balancing - Multi-Cluster Connectivity |
| Network Observability | 10% | - Hubble CLI and UI - Hubble and Layer 7 Visibility |
| Installation and Configuration | 10% | - Cilium CLI and Configuration - Installation and Connectivity Testing |
| BGP and External Networking | 6% | - Egress Connectivity - Connecting Cilium Clusters to External Networks |
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NEW QUESTION # 41
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: B
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 # 42
What is the default policy enforcement behavior?
Answer: B
Explanation:
Technical explanation
In Cilium's default policy-enforcement mode, an endpoint initially permits ingress and egress traffic.
Enforcement changes independently for each direction when a policy selects that endpoint. If a selecting rule contains an ingress section, the endpoint enters default-deny mode for ingress. If a selecting rule contains an egress section, it enters default-deny mode for egress. Only traffic explicitly permitted by the applicable policy rules remains allowed in the restricted direction.
This per-direction behavior is important. An ingress-only policy does not automatically restrict egress, and an egress-only policy does not automatically restrict ingress. Options A and B reverse the relationship between the rule section and the direction being enforced. Option C incorrectly states that selection places the endpoint into default-allow mode; default allow describes the endpoint's condition before it is selected by an enforcing policy.
Cilium also supports always and never enforcement modes. In always , enforcement applies even to endpoints not selected by policy. In never , policy enforcement is disabled. Policies can additionally use enableDefaultDeny for specialized visibility configurations, but those controls do not change the normal default behavior described in the question.
Official references
Policy Enforcement Modes .
Study Guide topic: Network Policy.
NEW QUESTION # 43
What does this Egress Gateway policy achieve?
Cilium Egress Gateway policy exhibit
Answer: B
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 # 44
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?
Answer: A
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 # 45
This an Ingress configuration. What is the equivalent Gateway API configuration?
Question 19 source Ingress
A)
Question 19 option A
B)
Question 19 option B
C)
Question 19 option C
D)
Question 19 option D
Answer: C
Explanation:
Technical explanation
Option B correctly represents the Ingress as a Gateway and an attached HTTPRoute . The Gateway is named cilium , uses gatewayClassName: cilium , and exposes an HTTP listener on port 80. The HTTPRoute uses parentRefs with the same Gateway name, cilium , so the route attaches to the declared listener. Its two rules preserve the original routing behavior: /details with PathPrefix targets the details Service on port 9080, while / with PathPrefix targets productpage on port 9080.
Option A declares a Gateway named cilium but attaches its route to nginx-gateway . Because the parent reference does not identify the displayed Gateway, it is not equivalent. Options C and D use kind: Route ; the correct resource kind for HTTP path routing is HTTPRoute . They also contain malformed or altered backend and matching fields. Option D changes the details backend name, while option C contains incorrect route structure and path content.
Cilium's official migration example uses the same conversion pattern: the Ingress class becomes the Gateway' s class, paths move into HTTPRoute.rules , and the route identifies its Gateway through parentRefs .
The supplied key incorrectly identifies A. The verified answer is B.
Official references
HTTP Migration Example .
Study Guide topic: Service Mesh.
NEW QUESTION # 46
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