KCNA Cloud Native Architecture Practice Question
In a service mesh architecture, which component is responsible for intercepting and managing traffic to and from a pod?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Sidecar proxy
The sidecar proxy (e.g., Envoy) runs alongside each service instance and intercepts all network traffic, enabling features like traffic management and observability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Sidecar proxy
Why this is correct
The sidecar proxy runs alongside each pod, intercepting inbound and outbound traffic at the pod level. It enforces the mesh's routing, mTLS and telemetry policies, which is why it, rather than the control plane, handles per-pod traffic management.
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Ingress controller
Why it's wrong here
An ingress controller routes external traffic into the cluster at the edge; it does not sit alongside each pod intercepting its inbound and outbound connections. It is tempting because both handle traffic entering workloads, yet the sidecar proxy, not the ingress layer, performs per-pod interception within the mesh.
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API gateway
Why it's wrong here
An API gateway manages north-south traffic between external clients and services, but it lacks the per-pod sidecar proxy needed to intercept and control east-west traffic within the mesh. This option is tempting because an API gateway also handles routing, authentication, and rate limiting for incoming requests, making it the correct choice when the question concerns external ingress rather than internal pod-to-pod communication.
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Control plane
Why it's wrong here
The control plane distributes configuration and policy to the mesh but never touches the data path, so it cannot intercept pod traffic. It is tempting because it governs proxies and certificates, and in a mesh it is the component administrators interact with most, yet interception is performed by the data plane sidecars.
Go deeper
Related to this question
Learn chapter
Observability: Monitoring, Logging, and Tracing
Key term
Service Mesh
A service mesh is a dedicated infrastructure layer that manages communication between microservices, handling tasks like service discovery, load balancing, encryption, and observability without requiring changes to application code.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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