The primary advantage of segmenting Virtual Machines (VM) using physical networks is the simplicity of network configuration and network monitoring. A VM is a software-based emulation of a physical computer that can run multiple operating systems and applications on the same hardware. A physical network is a network that consists of physical devices, such as routers, switches, cables, and connectors, that are used to connect and communicate between the VMs and the host system. Segmenting VMs using physical networks is a technique that involves dividing the VMs into separate and isolated groups or segments, based on the physical network devices and connections that they use. Segmenting VMs using physical networks can provide several benefits, such as improving the security, the performance, and the scalability of the VMs. The primary advantage of segmenting VMs using physical networks is the simplicity of network configuration and network monitoring, as it reduces the complexity and the overhead of managing and maintaining the virtual network devices and connections that are required for the VMs. Segmenting VMs using physical networks can also make it easier to troubleshoot and resolve any network issues or conflicts that may affect the VMs, as it provides a clear and direct visibility and control over the network traffic and the network resources that are used by the VMs. References: CISSP All-in-One Exam Guide, Eighth Edition, Chapter 4: Communication and Network Security, page 154. CISSP Practice Exam - FREE 20 Questions and Answers, Question 18.