What does DECnet refer to?

DECnet refers to a suite of protocols developed by Digital Equipment Corporation (DEC) for enabling communication over networks. It allows different types of computer systems to communicate with each other, sharing resources and data seamlessly. DECnet became popular in the 1970s and 1980s, particularly in environments that utilized DEC computers, providing a framework for file transfer, remote login, and other network services.

The protocols within the DECnet suite defined the rules and techniques for transmitting data packets across networks, making it essential for effective networking before the widespread adoption of TCP/IP. This characteristic of DECnet makes it clear why it is identified primarily as a suite of protocols for data packet transactions. The other options, while related to networking in some capacity, do not accurately describe the nature or purpose of DECnet.