Answer
Layers with identical checksums are reused, saving storage and reducing pull times.
Quick Answer
Docker images are built from layers, each identified by a SHA256 hash. If two images share a layer (same base image, same dependencies), Docker downloads and stores that layer only once. When pulling a new image, Docker skips layers it already has. This saves significant bandwidth and disk space in large deployments.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ