es in stateless or stateful manner. The Stateless Address AutoConfiguration (SLAAC) works by hosts receiving one or more IPv6 prefixes in Router Advertisements and combining them with Interface Identifiers to create 128-bit full IPv6 addresses. The Stateful Address xxxiv Glossary AutoConfiguration works by hosts using DHCPv6 to request and receive full 128-bit IPv6 addresses from a DHCPv6 server. Address formats IPv6 addresses always have some format in them. The basic formats indicate whether an address is unspecified, loopback, unicast, subnet anycast, or mul- ticast, link-local or global, or unique or local. The advanced address formats embed additional information inside the address, which can be, for example, IPv4 addresses, port numbers or port ranges, and hardware identifiers. Address prefix The high-order bits of an IPv6 address that determine the subnetwork the address belongs to. An individual link typically has a 64-bit prefix denoted as /64, while network operators are allocated a shorter prefix, such as /32. Address scopes IPv6 addresses can be of link-local or global scope. The link-local scoped addresses can only be used for on-link communication, while global addresses can be used for any communications. IPv6 had a site-local scope, but it has been deprecated in favor of Unique Local Addresses (ULA). ULAs are considered to be of global scope, even though they are not globally routable. Anycast address An address that identifies a set of interfaces, which typically are on different nodes. An IPv6 packet set to anycast address is delivered by the Internet's routing system to the nearest instance of an anycast address. Application layer Layer seven in the OSI model. This layer transports application- specific content in an application specific manner. Examples of such protocols include HTTP and SIP. Base Station Controller (BSC) Controls a group of base stations and handles mobility management between the BaseTransceiver Stations (BTSs) under its control. Base Station System GRPS Protocol (BSSGP) Pro