C3640-jk9s-mz.124-16.bin

| Need | Better choice | |------|----------------| | IPv6 | c3640-js3x-mz.124-25d.bin | | More stability | c3640-jk9s-mz.124-24e.bin (later 12.4) | | Modern security | IOS 15.1 on 3940 or ISR G2 | | Learning current tech | Cisco CSR1000v (virtual) |

So, in plain English: This is an IOS version 12.4(16) image for the Cisco 3640 router, with enterprise features and strong encryption, designed to run from compressed RAM. c3640-jk9s-mz.124-16.bin

: It is the primary image used for labs on platforms like GNS3 and GNS3Vault . | Need | Better choice | |------|----------------| |