In this OODAcast we provide insights into Zero Trust architectures from an experienced practitioner, Junaid Islam. Junaid is a senior partner at OODA. He has over 30 years of experience in secure communications and the design and operations of highly functional enterprise architectures. He founded Bivio Networks, maker of the first gigabyte speed general purpose networking device in history, and Vidder, a pioneer in the concept of Software Defined Networking. Vidder was acquired by Verizon to provide Zero Trust capability for their 5G network. Junaid has supported many US national security missions from Operation Desert Shield to investigating state-sponsored cyberattacks. He has also led the development of many network protocols including Multi-Level Precedence and Preemption (MLPP), MPLS priority queuing, Mobile IPv6 for Network Centric Warfare and Software Defined Perimeter for Zero Trust. Recently Junaid developed the first interference-aware routing algorithm for NASA’s upcoming Lunar mission.