Glossary 6to4 A tunneling protocol that enables two nodes running both IPv4 and IPv6 across an IPv4 routing infrastructure to use a special address obtained by combining the prefix 2002::/16 with the 32-bit public IPv4 address to form a 48-bit prefix of the form 2002:wwxx:yyzz::/48 in the case of a public IPv4 ad- dress w.x.y.z. These nodes use this address type when communicating with each other. 802.1X authentication A series of standards that determine the acceptance of connection requests to IEEE 802.11 wireless or IEEE 802.3 wired networks. access control list (ACL) A list of users and groups that can access an object, such as a file, folder, or printer, and the type of access granted. access-based enumeration A technology that enables administrators to hide folders that users do not have permission to access so that individual users can see only those items that they are entitled to access.