The DDP and socket are described. The format of the datagram, DDP interfaces and routing algorithms are discussed. The DDP communication routine of AppleTalk based on Macintosh is also given.

• 文中论述了DDP及其套接字,讨论分析了DDP数据报格式、DDP接口及路由算法,并结合基于MAC的AppleTalk局部网给出了DDP通信例程。