This is a Layer 3 image. It behaves like a router, supporting advanced routing protocols (OSPF, BGP, EIGRP) and various WAN features.
There are three main ways to run Cisco IOS virtually, but IOL (and this specific 2018 build) is often preferred for several reasons: i86bilinuxl3adventerprisek9m21573may2018bin
You won't find this file on a standard Cisco router. Instead, it is used in: This is a Layer 3 image
This specific string, , is a filename for a Cisco IOS software image. Specifically, it is a Cisco IOL (IOS on Linux) binary used primarily in network simulation environments like EVE-NG , GNS3 , or PNETLab . supporting advanced routing protocols (OSPF