nxos703i79.bin refers to a specific system image file for running NX-OS (likely version 7.0(3)I7(9) or a derivative). The “UPD” in the request likely means “update” — i.e., downloading this binary to perform an In-Service Software Upgrade (ISSU) or disruptive upgrade.
This guide provides a general outline. For precise instructions, consulting the official documentation or a network expert familiar with Cisco Nexus devices is recommended. nxos703i79bin upd download