In the Juniper Apstra design phase, which object dictates port count, port speed, and how...

Interface maps are objects that map interfaces between logical devices and physical hardware devices in the Juniper Apstra design phase. They dictate port count, port speed, and how the ports would be used for achieving the intended network configuration rendering. Interface maps also allow you to select device ports, transformations, and interfaces, provision breakout ports, and disable unused ports. For more information, see Interface Maps (Datacenter Design). References:

Interface Maps (Datacenter Design)

Design

Interface Maps Introduction