In which of the following will unencrypted network traffic most likely be found?

IoT (Internet of Things) devices are often designed with simplicity and low power consumption in mind, leading to less robust security implementations. Many older or lower-cost IoT devices transmit data, including sensitive information, over unencrypted channels by default, making them vulnerable to eavesdropping. While security is improving, unencrypted traffic remains a significant concern in the IoT ecosystem. SDN (Software-Defined Networking) focuses on network management and control plane separation; it doesn't inherently dictate encryption levels for data plane traffic. VPNs (Virtual Private Networks) are specifically designed to create encrypted tunnels for secure communication over untrusted networks. SCADA (Supervisory Control and Data Acquisition) systems, while historically vulnerable, are increasingly incorporating security measures, including encryption, due to their critical nature in industrial control.