Which resource tag denotes a specific version of an image within an ImageStream?

Which resource tag denotes a specific version of an image within an ImageStream?

• A. ImageStream
• B. BuildConfig
• C. Deployment
• D. ImageStreamTag

Answer: (D)

The key idea is that an ImageStreamTag is the exact reference to a specific image version inside an ImageStream. An ImageStream acts as a collection of image tags and tracks updates to images in a registry. Each tag within that stream can point to a particular image, and the ImageStreamTag resource represents that precise version (the combination of the stream and the tag, often including the image digest). This is why an ImageStreamTag is used to denote a concrete version like myimage:v1.2.3, ensuring deployments pull a fixed image rather than a moving tag. BuildConfig builds images, Deployment runs them, and ImageStream is the container of tags, but only the ImageStreamTag pins a specific version.

The key idea is that an ImageStreamTag is the exact reference to a specific image version inside an ImageStream. An ImageStream acts as a collection of image tags and tracks updates to images in a registry. Each tag within that stream can point to a particular image, and the ImageStreamTag resource represents that precise version (the combination of the stream and the tag, often including the image digest). This is why an ImageStreamTag is used to denote a concrete version like myimage:v1.2.3, ensuring deployments pull a fixed image rather than a moving tag. BuildConfig builds images, Deployment runs them, and ImageStream is the container of tags, but only the ImageStreamTag pins a specific version.