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This practical, detailed tutorial examines the relationships of data communications and distributed networks_with emphasis on distributed communications protocols, distributed data bases and client-server relationships. Key Features Provides a user-friendly, non-algorithmic description of the subject, with extensive use of graphics, flow charts, and tables. Highlights prevalent distributed network protocols. Describes how to manage distributed networks. Explains how to partition databases and software into the distributed processors. Features a comprehensive, practical case study on data communications, line loading and network design. Provides expanded coverage of client-server relation-ships, remote procedure calls (RPCs), and remote data access (RDA). Compares and contrasts the distributed aspects of OSI and TCP/IP. Considers the  Internet working of personal computers. Reflects new standards, such as the IEEE 802 LAN and CCITT, Integrated Services Digital Network (ISDN) Standards and the revised X.25, X.75, X.3, X.28 and X.29 Standards. Table of Contents Preface Introduction Overview of a Data Communications Network Data Communications Systems Operations Major Components in a Data Communications Systems Software and Data Bases Transmission Impairments Data Link Controls/Line Protocols Digital Transmission Distributed Network Architectures Remote Procedure Calls Local Area Networks Managing Distributed Systems Design Considerations Index