List of Acronyms AA AAAA ABR ACD ACELP ACK AD ADPCM ADSL AF AFI AfriNIC AH AIX AMI ANS ANSI AOL API APNIC APPC APPN ARIN Authoritative Answer IPv6 DNS record Area Border Router Automatic Call Distribution Algebraic-Code-Excited Linear Prediction Acknowledgment Active Directory Adaptive Differential Pulse Code Modulation Asymmetric Digital Subscriber Loop Address Family Address Family Identifier (RIP); Authority and Format Identifier (IS­IS) African Network Information Center Authentication Header Advanced Interactive Executive (IBM's Unix) Alternate Mark Inversion Advanced Network Service American National Standards Institute America On-Line Application Program Interface Asian Pacific Network Information Center Advanced Program-to-Program Communications Advanced Peer-to-Peer Networking American Registry for Internet Numbers