This book constitutes the refereed post-conference proceedings of the 27th International Conference, on Distributed and Computer and Communication Networks, DCCN 2024, held in Moscow, Russia, during September 23-27, 2024.The 34 full papers and 2 short papers included in this book were carefully reviewed and selected from 107 submissions. They are organized in these topical sections: Computer and Communication Networks; Analytical Modeling of Distributed Systems; and Distributed Systems Applications.