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Layered Architecture — Core Concept

publish date: 2026/06/10 21:07:22.248976 UTC

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In a layered architecture, what is the key rule that governs how layers interact with each other?

Each layer can call any other layer directly to optimize performance

The top layer manages all layers directly, with no inter-layer communication

Layers communicate exclusively through shared global variables

Each layer only relies on the facilities and services offered by the layer immediately beneath it

Correct Answer

Each layer only relies on the facilities and services offered by the layer immediately beneath it

Explanation

In a layered architecture, the system functionality is organized into separate layers and each layer only relies on the facilities and services offered by the layer immediately beneath it. This strict rule supports separation and independence, allowing layers to be developed, changed, and replaced independently.

Reference

Software Engineering, Ian Sommerville, 10th edition

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