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: Indicates the architecture (Intel x86) and that it is a "Business Image" for Linux. linux : The target host operating system.

: Indicates this is a Layer 3 image, functioning as a router with advanced switching features.

This image is rarely used standalone. Instead, it is the "engine" behind popular network simulation platforms:

: Indicates that this binary was originally compiled for x86 architecture.

Upload the file to /opt/unetlab/addons/iol/bin/ using an SFTP client.