Which statement about NAT and IPv6 autoconfiguration is accurate?

• A. NAT is required in IPv6 to conserve addresses.
• B. IPv6 eliminates the need for NAT in most scenarios and supports autoconfiguration, while IPv4 relies on NAT to conserve addresses.
• C. IPv6 uses ARP for address resolution.
• D. NAT provides end-to-end addressing in IPv6.

Answer: (B)

IPv6 is designed so NAT isn’t needed for most networks and devices can autoconfigure themselves. Its vast address space and built‑in autoconfiguration mechanisms mean a device can obtain a usable address and network settings automatically, using methods like SLAAC (Router Advertisements provide a network prefix) or DHCPv6 for stateful config. This stands in contrast to IPv4, where NAT became a common tool to conserve limited addresses by letting many devices share one public address, often paired with manual or semi-automatic configuration. Also, IPv6 does not use ARP for address resolution; it relies on Neighbor Discovery, which serves a broader role than ARP in IPv4. NAT is not part of the IPv6 end‑to‑end model, and although NAT66 exists in some setups, it is not the standard approach and is generally discouraged because it breaks end‑to‑end connectivity. So the statement that best describes NAT and IPv6 autoconfiguration is that IPv6 eliminates the need for NAT in most scenarios and supports autoconfiguration, while IPv4 relies on NAT to conserve addresses.