: Stands for Layer 3 . It tells the engineer that this image behaves as a router. It supports routing protocols like OSPF, BGP, EIGRP, and advanced L3 capabilities, distinguishing it from an L2 (Layer 2) switching image.
When importing into GNS3 via the GNS3 Appliance Marketplace , you must configure the system to support 32-bit binaries, as the underlying architecture is i86 . If you encounter a Could not start IOU error, you must install 32-bit library support on your GNS3 VM console: i86bilinuxl3adventerprisek9m21573may2018bin
: The standard executable binary extension for the UNIX/Linux subsystem. : Stands for Layer 3