C2691-advipservicesk9-mz.124-17.image -

The generic file extension for Cisco IOS binaries.

This is the most critical part of the filename, describing the software capabilities included in the binary. C2691-advipservicesk9-mz.124-17.image

Following the platform is advipservicesk9 . This segment describes the software feature set and licensing level: The generic file extension for Cisco IOS binaries

The Cisco 2691 router was MIPS-based, meaning its hardware could be nearly perfectly emulated on a PC using an emulator called C2691-advipservicesk9-mz.124-17.image

Cisco IOS software is proprietary. To use this image legally, you must have a valid software license from Cisco Systems

: Indicates the image runs from RAM ( m ) and is compressed using zip ( z ).