Computer networks and distributed systems

Three major justifications for distributed computing-sharing physically distributed resources, combining computers for fast solutions, and providing reliability through replication-are discussed. Distributed computing milestones from 1969 to 1991 are examined, focusing on the ARPAnet national research network, Ethernet and token-ring local area networks, and workstation networks united by distributed systems software. Three themes that dominate current trends in distributed systems and computer networks are examined. They comprise tapping the immense data-carrying potential of optical fibers, efficiently using tightly coupled networks of thousands of computers, and making network access inexpensive so many people will buy services. Developments for the next decade are predicted by extrapolating from these trends.<>