802.1Q This technology inserts tags into frames in order to identify traffic belonging to specific VLANs over a trunk link.
802.1x A security protocol suite for authentication of LAN and WLAN users.
ACE An access control entry is a permit or deny statement in an access control list.
ACL An access control list is a list of access control entries that are checked to match traffic on a Cisco device; these ACLs are often used to filter traffic when assigned to an interface.
administrative distance A value that ranges from 0 through 255, which determines the believability of a source’s routing information; lower is more preferred.
advanced distance vector protocol A routing protocol that combines some of the characteristics of both distance ...