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A service mesh (e.g. Istio, Linkerd) primarily adds which capability to a microservices system?
ADisk encryption on the application's compute nodes
BOut-of-band traffic management, observability, and mTLS between services via sidecar proxies
CDatabase query caching at the network layer
DSource-code static analysis at build time
Answer & Solution
Correct answer: B. Out-of-band traffic management, observability, and mTLS between services via sidecar proxies
A mesh injects sidecar proxies that handle routing, retries, traffic shaping, telemetry, and service-to-service mTLS — without the app having to know. The other options live at other layers.
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