A civic IoT fleet will grow to about 5,000 sensors on the city network. Which security design is most appropriate at that scale?
Select an answer to reveal the explanation.
Short Explanation
One shared PSK for five thousand sensors is like one master key for every city building—lose it once and the whole fleet is open. Unique credentials, a segmented VLAN, and monitoring scale with the city. Flat staff VLANs and no crypto do not.
Full Explanation
Large IoT fleets require authentication and credential models that limit blast radius—unique device credentials or tightly scoped group secrets, network segmentation onto dedicated IoT VLANs, and continuous monitoring. A single shared PSK across thousands of devices, co-location on staff VLANs without oversight, or disabling link encryption are unsafe at municipal scale even when individual payloads are small.