Final answer:
IPv6 unicast addresses identify single devices and include global, link-local, and unspecified (::) addresses, but the correct loopback address is ::1, not ::11.
Step-by-step explanation:
An IPv6 unicast address indeed identifies a single device on the internet with a one-to-one mapping. These addresses come in various types and serve different functions. For instance:
- Global unicast addresses are for general use on the internet similar to IPv4 public addresses.
- Link-local unicast addresses are used for communication within a single network segment that a host is connected to. Routers do not forward packets with link-local addresses outside the network segment.
- The loopback address is ::1, not ::11, which is used by a device to send a packet to itself.
- The unspecified address is ::, which is used in situations where an address is not specified.
The correct parts of the statement in the question are global, link-local, and unspecified addresses, with the loopback address needing correction to ::1.