: Typically indicates a 1024 MB (1 GB) memory footprint or file size. : The standard binary file extension for Cisco firmware. If you are looking to download official firmware for a Nexus 9000
Why are you searching for nxos64cs1024mbin specifically? Usually, it is because: nxos64cs1024mbin download link
This is the Kickstart or System Image used to boot or upgrade a Cisco Nexus switch. : Typically indicates a 1024 MB (1 GB)