Which statement best describes the benefit of IPv6 addressing for IoT?

• A. A larger address space (128-bit) supports more devices
• B. Increased encryption by default
• C. Requires more energy per device
• D. Is less scalable for large networks

Answer: (A)

The main idea being tested is that having a very large address space is the key advantage of IPv6 for IoT. IPv6 uses 128-bit addresses, which means there are 2^128 possible addresses. That enormous space lets each IoT device have a unique global address, even as the number of devices scales to billions. This enables direct communication, easier auto-configuration, and simpler, more scalable routing without relying on complex workarounds like network address translation (NAT). In short, the huge address space directly supports deploying and managing a vast IoT ecosystem.

The other options don’t capture this primary benefit. Encryption in IPv6 isn’t built-in by default (IPsec exists but is optional), so increased encryption by default isn’t guaranteed. Requiring more energy per device isn’t a goal of IPv6 and isn’t a design feature of the protocol. And IPv6 actually improves scalability for large networks, not reduces it.