Cisco Certified Network Associate (CCNA) Practice Exam

Which method is NOT used for allocating IPv6 addresses?

1. Dynamic Host Configuration Protocol for IPv6

2. Subnet-router anycast address assignments

3. Neighbor discovery mechanisms

4. Static NAT for IPv6 addresses

The correct answer is: Static NAT for IPv6 addresses

The allocation of IPv6 addresses involves various methods designed to facilitate address assignment and management within networks. Static NAT (Network Address Translation) for IPv6 is not a method used for allocating IPv6 addresses because NAT itself is typically associated with IPv4. In IPv6, the design philosophy aims to eliminate the need for NAT by providing a significantly larger address space. Therefore, the use of Static NAT does not align with the IPv6 address allocation strategy. In contrast, methods like Dynamic Host Configuration Protocol for IPv6 (DHCPv6) actively assign addresses to clients dynamically. Subnet-router anycast address assignments utilize IPv6 anycast to ensure that packets are delivered to the nearest router from a group of potential candidates. Additionally, Neighbor Discovery Protocol is fundamental for address resolution and determining link-layer addresses, demonstrating the various protocols that do support IPv6 address management and allocation.