[repack] - I86bi-linux-l3-adventerprisek9-15.4.2t.bin

: This indicates the architecture. "i86" refers to the x86 CPU architecture, and "bi" stands for Business Image (often used interchangeably with binary).

: This is the IOS version. The 15.x code base is the modern standard for Cisco certification exams. i86bi-linux-l3-adventerprisek9-15.4.2t.bin

GNS3 supports IOL via the GNS3 VM. It remains a staple for those who prefer an open-source workflow. : This indicates the architecture