This book constitutes the thoroughly refereed proceedings of the 26th International Conference on Computer Networks, CN 2019, held in Gliwice, Poland, in June 2019.

Computer Networks.- Performance Modeling of the Consensus Mechanism in a Permissioned Blockchain.- An Architectural Framework Proposal for IoT Driven Agriculture.- The Procedure of Key Distribution in Military IoT.- Modeling of Computer Networks Using SAP HANA Smart Data Streaming.- An Impact of Jamming Signal on the Energy Efficiency of ZigBee Network Elements.- Quantum Switch Realization by the Quantum Lyapunov Control.- Simulation Analysis of Packet Delivery Probability in LoRa Networks.- Comparative Study Between Reactive and Proactive Protocols of (Manet) in Terms of Power Consumption and Quality of Service.- Extending Lifetime of Wireless Sensor Network in Application to Road Traffic Monitoring.- BotGRABBER: SVM-based Self-Adaptive System for the Network Resilience Against the Botnets' Cyberattacks.- Cyber Attack Detection by Using Neural Network Approaches: Shallow Neural Network, Deep Neural Network and AutoEncoder.- Temporal Characteristics of CodeSys Programmed Raspberry Pi and Beaglebone Black Embedded Devices.- Ateb-prediction Method use for High Quality Video Traffic Forecasting.- A Comparison of Request Distribution Strategies Used in One and Two Layer Architectures of Web Cloud Systems.- Communications.- Mobile Voice Traffic Load Characteristics Based on Real Data.- Vehicle in Motion Weighing Based on Vibration Data Collected from Sensor Network.- Optimal Spectrum Sharing in RF Energy Harvesting Cognitive Femtocell Networks.- Accuracy of UWB Location Tracking Devices when on the Move.- Cells Interrelation in Mobile Networks.- Communication Model of Smart Substation for Cyber-Detection Systems.- Virtual Oversampling of Sparse Channel Impulse Response.- Recreation of Containers for High Availability Architecture and Containerbased Applications.- Queueing Theory and Queuing Networks.- Analysis of Energy Consumption in Cloud Center with Tasks Migrations.- Queueing Systems with Non-Homogeneous Customers and Infinite Sectorized Memory Space.- Transient Solution of a Heterogeneous Queuing System with Balking, and Retention of Reneging Customers.- Cluster-based Web System Models for Different Classes of Clients in QPN.- Performance Analysis of the HTTP Protocol in Networked Control Systems.- A System with Warm Standby.- AQM Mechanism with the Dropping Packet Function based on the Answer of Several PIa Controllers.