Final answer:
In IPv6 networking, the first half of a global unicast address is known as the prefix, and the second half is appropriately referred to as the suffix.
Step-by-step explanation:
The first half of the global unicast address is called the prefix, and the correct option for the second half of the address is that it is called the suffix. Global unicast addresses are used in IPv6 networking to uniquely identify interfaces across the entire IPv6 internet. In an IPv6 address, the distinction between the network prefix and the host or interface identifier (suffix) is determined by the prefix length.