Which two bootstrap technologies are supported by Cisco NX-OS platforms?

In Cisco NX-OS platforms, two common bootstrap technologies are supported: iPXE (Internet Protocol eXtensible Environment) and POAP (PowerOn Auto Provisioning). iPXE allows for network booting using software such as DHCP or TFTP to load an operating system over a network interface independently of data storage devices like hard disks or CD-ROM drives. POAP automates the process of upgrading software images and installing configuration files on switches that are being deployed in the network for the first time. References := Cisco NX-OS Software