Which section is NOT part of an IPv6 global unicast address?

In an IPv6 global unicast address, the structure is defined by several key components that work together to uniquely identify a host on a global scale. The global unicast address is primarily composed of the global routing prefix, subnet identifier, and interface identifier.

The global routing prefix indicates the network portion of the address, allowing the address to be routed on the internet. The subnet identifier, meanwhile, is used within the local network to identify specific subnets. Finally, the interface identifier uniquely identifies an interface on a host within that subnet.

While the subnet selector might appear to be related to networking, it does not represent a formal part of the hierarchy or structure of an IPv6 global unicast address. Instead, it may refer to identifying or managing subnets within a routing table or configuration, but it is not a recognized component of the address format itself.

Understanding these components is vital for effectively working with IPv6 addressing, ensuring proper network design, and facilitating routing across different networks.