Vios: Indicates this is a Virtual IOS image, specifically designed to run on hypervisors rather than physical hardware.Adventerprisek9: This signifies the "Advanced Enterprise Services" feature set. It includes the most comprehensive range of Cisco features, such as full routing protocols (OSPF, EIGRP, BGP), advanced security, and VPN capabilities.159-3.m6: This refers to the IOS version—in this case, version 15.9(3)M6. The "M" indicates a long-term maintenance release, which is generally more stable.Qcow2: This is the disk image format (QEMU Copy-On-Write) used primarily by QEMU and KVM, making it compatible with GNS3 and EVE-NG. Key Features of the 15.9(3)M6 Image Users choose this specific version for several reasons:
: Use the "Cisco vIOS-L3" appliance template. This template automates the resource allocation (RAM and CPU) required for the image to boot efficiently. Key Features to Test Download Vios-adventerprisek9-m.spa.159-3.m6.qcow2