Digital network architecture (DNA) is DEC’s complex architecture for computer networks. It is complex because it is incredibly flexible in network configuration and application functionality. This book about hybrid networks provides the reader with a perspective on networks and subnetworks and how various protocols fit into the larger networking picture.

Phase V (called “Advantage-Networks” in DEC marketing materials) is actually three different networks. These include a subset of OSI; a set of services compatible with earlier generations of DECnet; and a new set of modern proprietary services from DEC, such as the DNA naming services. The book also introduces related protocols, such as Ethernet, token ring, FDDI, HDLC, and TCP/IP.

This book is required reading for those involved with DECnet systems and applications. It provides a readable and interesting discussion of the integration of DECnet with the OSI standards. It also provides valuable insights for those who deal with hybrid networks in general.