I86bilinuxl3adventerprisek9m21573may2018bin

It looks like you’ve provided a string that resembles a filename for a Cisco IOS binary image, possibly for a router or switch.

• Compiled in May 2018.
• For a lab image, this is modern enough to support current routing features but old enough that it’s no longer under support.

Version (15.7-3.M2):

The 157-3 and m2 segments refer to the IOS software version 15.7(3)M2, released around May 2018. Role in Network Simulation i86bilinuxl3adventerprisek9m21573may2018bin

• The executable file. Load this directly into your hypervisor or emulator.