Which statement is true about an image ID?

Which statement is true about an image ID?

• A. It is a checksum from the registry
• B. It is the image digest
• C. It is a tag in the registry
• D. It is a checksum based on the local container image

Answer: (D)

An image ID is the fingerprint of the local image. It serves as a content-based identifier for the exact image stored on your host, typically computed as a digest (a checksum) of the image’s configuration and layers. This means the image ID is tied to the specific local copy you have, not something the registry provides or a label you apply in the registry. That’s why describing it as a checksum based on the local container image is the best answer: it reflects the exact content you have on your machine, independently of any registry digest or tag. The registry can expose an image digest for a remote version and images can have tags in the registry, but the local image ID is a separate, locally computed fingerprint.

An image ID is the fingerprint of the local image. It serves as a content-based identifier for the exact image stored on your host, typically computed as a digest (a checksum) of the image’s configuration and layers. This means the image ID is tied to the specific local copy you have, not something the registry provides or a label you apply in the registry.

That’s why describing it as a checksum based on the local container image is the best answer: it reflects the exact content you have on your machine, independently of any registry digest or tag. The registry can expose an image digest for a remote version and images can have tags in the registry, but the local image ID is a separate, locally computed fingerprint.