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Предложен основанный на теоретико-информационном подходе метод оценки эффективности сетей передачи данных. Метод позволяет получить априорную оценку эффективности проектируемой сети на основе информации о ее параметрах, так как для получения оценки не требуется наличия действующей сети и данных, получаемых в процессе ее эксплуатации. Дано описание метода, а также приведены примеры его использования для оценки эффективности сетей доставки контента и сетей на базе peer-to-peer-технологии., Purpose. Development and investigation of the method for analytical estimation for the efficiency of data transmission networks basing on the details of the supposed network parameters. This method allow us to evaluate a priori comprehensive estimation of efficiency of the network being designed without the necessity of collecting and analyzing real world network operational data. Methodology. A set of files to be downloaded by the network node is considered as a subsequence of letters generated by stationary and ergodic process. Basing on the fundamentals of Information theory the entropy efficiency was defined to characterize a capacity of data transmission network. Informally, the value actually indicates the growth rate of the amount of files that can be transmitted via the network depending on a certain unit of time. To model the distribution of the probability of access to files, Zipf’s law was used. Findings. A general description of a method for efficiency estimation of data transmission networks was presented in the paper. Detailed guidelines to apply the method to the estimation of multimedia content delivery networks and file sharing P2P networks, i. e. systems of two wide spread classes, were shown. The method was also investigated on the software models of the systems to show the possibility of using the method as a tool for optimal selection of network parameters. Originality/value. The suggested information-theoretic method is aimed to analytically estimate the efficiency of the data transmission networks. It can be used as a strong tool to construct both new multimedia data transmission systems and optimization of the existing services., №3(23) (2018)