The k9 designation means the image includes 3DES (168-bit) and AES (128, 192, 256) encryption algorithms for IPsec. To verify, after booting, run:
The c2691-advipservicesk9-mz.124-17.image is a legacy Cisco IOS software image designed for the . While the hardware is largely obsolete in production environments, this specific image remains a cornerstone for network engineering students and professionals using emulation software like GNS3 and EVE-NG. Overview: c2691-advipservicesk9-mz.124-17 Platform: Cisco 2691 Router. C2691-advipservicesk9-mz.124-17.image
This is the most critical part of the filename, describing the software capabilities included in the binary. The k9 designation means the image includes 3DES