• Wireless Sensor Networks
• Broadcast protocols
• Virtual Synchrony

This thesis presents the design, implementation and evaluation of a broadcast protocol using Virtual Synchrony paradigm in order to guarantee data consistency on sensors in a Wireless Sensor Network.
The thesis can be divided into two parts: the first contains an introduction to the main concepts: Wireless Sensor Networks (WSN)s, fault tolerance and VS. Since, WSNs are a collection of nodes organized into a distributed system, we can see each sensor as a replica, so we propose a broadcast protocol to guarantee consistency among sensors and explain how using VS we can improve fault tolerance. In the second part, we describe the design of a simulation of our protocol and evaluate the results. The simulation is based on the OMNeT++, a C++-based open simulation framework. We evaluate the proposal protocol by comparing the results of different network topologies and a generic broadcast protocol without guarantees.