Vehicular Ad Hoc Networks (VANETs) are special type of decentralized wireless networks among the various mobile nodes. In VANET decision of forwarding the data packets from one node to other node is dynamic and based on the network connectivity. So efficient, optimized and secure techniques are required for secure transmission of data packets and tracking the changing topology of the network. We propose an ACO based Routing Algorithm in which data packets are forwarded based on the trustworthiness of the neighbor node. The nodes exchanges the Ants (agents) between source and destination deposit the pheromone based on the best path between the source and destination. In this proposed scheme we have projected Ant colony algorithm to defense against malicious attack. It also isolates various attacks and provides secure as well as optimize route from source to destination. We have also analyzed the performance metrics such as packet delivery ratio, end-to-end delay, routing overhead and energy consumption. Simulation result shows that our approach is efficient and reliable.

Mobile Ad hoc Network (MANET) can be said as a collection of mobile nodes, which builds a dynamic topology and a A resource constrained network. In this paper, we present a survey of various testbeds for Mobile Ad hoc Networks. Emulator provides environment without modifications to the software and validates software solutions for ad hoc network. A field test will show rather the simulation work is going on right track or not and going from the simulator to the real thing directly to analyze the performance and compare the results of routing protocols and mobility models. Analyzing and choosing an appropriate emulator according to the given environment is a time-consuming process. We contribute a survey of emulation testbeds for the choice of appropriate research tools in the mobile ad hoc networks.

Nowadays, there are lots of IoT devices are used in Industry, Home appliances, Automobile industry and many more places. Issues regarding security of the Internet of Things (IoT) are the primary reason why it fails to attract more people. Each day, beside the new technology comes a millions of vulnerabilities waiting to be exploited. IoT is that the latest trend and like all technology, it's open for exploitation. In IoT environment, Denial of Service (DoS) attack block the usage of authentic user and consume bandwidth, make network resource unavailable; if this attack is performed from different sources its call Distributed Denial of Service attack (DDoS). DDos attack is the most common attack which is used to bring down the whole network without having any loophole in the network security. Here in this paper we put concentration on DDoS. To mitigate such attack it need some techniques that can detect and prevent it from attack. In this paper we discuss different techniques of mitigating DDoS attacks on IoT.

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