To answer the need for digitalization of the educational system in Croatia, the Croatian Academic and Research Network (CARNet) has started an e-Schools program, with the first phase that includes a pilot project under the name “e-Schools: Establishing a System for Developing Digitally Mature Schools (pilot project)”, which was implemented from 2015-2018. The objectives of this thesis are: to explain the importance of digital education and digitally mature schools, to outline the objectives and main activities of the e-Schools project, to describe the ICT infrastructure and the underlying concepts that have been implemented in the scope of the project so far, to analyze the performance of the implemented infrastructure at the network traffic level, to assess various aspects of the Quality of Experience of students and teachers, and to evaluate the network and service performance in schools taking part in the e-Schools project, taking into consideration all the findings. In the scope of this thesis, implemented infrastructure on the network traffic level is analyzed through Meraki dashboard interface in 27 chosen schools taking part in the e-Schools project. Subjective ratings related to various Quality of Experience aspects are provided by 154 teachers and 400 students coming from participating schools across Croatia and are being assessed through an online form. Based on all the findings, it can be concluded that the implemented infrastructure, along with the ICT equipment, has satisfactory performance and contributes to achieving digital maturity in Croatian schools. However, there is room for improvement and advancement, which should definitely be considered during the implementation of network infrastructure in the rest of Croatian schools during the second phase of the project planned for a period from 2018-2022.