A mobile ad hoc network is a self-configuring and self organizing infrastructure less network of mobile nodes; these nodes are dynamic in nature and are capable of communicating with each other without the use of a network infrastructure or any centralized administration. With the ease of deployment and the infrastructure less nature of Mobile Ad hoc Networks (MANETs) make them highly popular for the current multimedia communications, so there has been considerable research in routing area. Research shows that Ad Hoc on Demand Distance Vector Routing Protocol (AODV) performs better than any other protocol. Although it performs well but there must be a mechanism to analyze its performance by varying network size. In this paper analyzing the performance of AODV using Travelling Salesman Problem by increasing number of nodes as it is known that routing protocols makes an important task for improving QoS in Mobile Ad hoc Network. The Qos depends upon several parameters like throughput, network load etc. Only throughput parameter has been considered for the simulation. The simulation work has been carried out in Network Simulator (ns-2).

Fault tolerance is one of the main issues in Wireless Sensor Networks (WSNs) since it becomes critical in real deployment environment where reliability and reduced inaccessibility times are important. In this paper, we propose a fault–tolerance technique for coverage area of the sensor network that enhances the energy efficiency by reducing the communication, with the help of Constrained Delaunay Triangulation intersect line. Further by applying the above approach, we reduce the energy consumption and congestion in the network. In last, we describe our approach with a case study that our approach is better in fault tolerance and energy saving.

(DT) and concluded that our approach is better in fault tolerance and energy saving.