AAA：Authentication Authorization Accounting，认证、授权、计费
ADS：Aggregate Directory Services，聚合目录服务
AH：Authentication Header，分组头认证
APNIC：Asia-Pacific Network Information Center，亚太网络信息中心
ARP：Address Resolution Protocol，地址解析协议。关联词：RARP
ARPANET：Advanced Research Project Agency NETwork，ARPA网
ARQ：Automatic Retransmission Request，自动请求重传
AS：Autonomous System，自治系统
ASP：Application Service Provider，应用业务供应商
AUI：Attachment Unit Interface，接入单元接口
