Final answer:
A Link-local address is the only type of IPv6 address required for devices to communicate on a local network. It enables devices to communicate with other nodes on the same local network segment without needing global or multicast addresses.
Step-by-step explanation:
The only type of IPv6 address required to communicate with other computers on a local network is the Link-local address. A link-local address is used by devices for communicating with other nodes on the same link in a local network segment. IPv6 link-local addresses are auto-configured and do not need a central authority for management. Aside from link-local addresses, IPv6 also has Global, Site-local (deprecated), and Multicast addresses, but for local network communication, a global address is not necessary, and the concept of site-local addresses has been deprecated in favor of Unique Local Addresses (ULAs). Multicast addresses are used for specific purposes such as addressing groups of devices rather than for standard device-to-device communication on a local network.