Cisco Certified Network Associate (CCNA) Practice Exam

Which IPv6 address type starts with 2000::/3?

1. Global Unicast

2. Link-Local Unicast

3. Unique Local Address

4. Multicast

The correct answer is: Global Unicast

The IPv6 address type that starts with 2000::/3 is indeed Global Unicast. In the context of IPv6 addressing, Global Unicast addresses are routable on the global internet and are used for communication beyond a local network. The prefix 2000::/3 indicates that any address falling within this range utilizes the structure designed for global routing. Global Unicast addresses are essential for public network communication since they enable devices to be uniquely identified and reachable over the internet. This address type is analogous to IPv4 public address space, allowing devices across different networks to communicate with one another seamlessly. In contrast, other address types serve different purposes; for instance, Link-Local addresses are used for communication within a single local network segment, Unique Local Addresses are intended for private networks similar to IPv4 private addressing, and Multicast addresses are used to send a packet to multiple destinations simultaneously. Understanding these distinctions and the specific nature of Global Unicast addresses clarifies the rationale for selecting this answer.