This thoroughly revised textbook provides a description of current networking technologies and prools as well as important new tools for network performance analysis based on queuing theory. The third edition adds topics such as network virtualization and new related architectures, novel satellite systems (such as Space X, OneWeb), jitter and its impact on streaming services, packet level FEC techniques and network coding, new Markovian models, and advanced details on M/G/1 queuing models. The author also adds new selected exercises throughout the chapters and a new version of the slides and the solution manual. The book maintains its organization with networking technologies and prools in Part I and then theory and exercises with applications to the different technologies and prools in Part II. This book is intended as a textbook for master level courses in networking and telecommunications sectors.