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This image is a virtualized version of the Cisco IOS (Internetwork Operating System) designed to run natively on a Linux platform. The name itself provides a breakdown of its capabilities:

Understanding the Cisco IOU Image: i86bi-linux-l2-adventerprisek9-15.2d.bin i86bilinuxl2adventerprisek9152dbin best

According to discussions on GNS3 forums , the version is popular because it supports a wide range of modern switching features. However, it is not without its quirks: This image is a virtualized version of the