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In this Research Paper, We have evaluated the performance of IPv4 and IPv6 using Windows XP and Windows 7. In this study TCP (Transmission Control Protocol) Throughput and UDP (User Datagram Protocol) Throughput have been compared for protocol IPv4 and IPv6. Experimental results showed that Windows XP provides better results for UDP Throughput than Windows7 & Windows7 can provide better results for TCP Throughput than Windows XP. Results indicated that IPv4 have superior results in terms of TCP throughput and UDP throughput as compared to IPv6.

Network aggregation mechanism for vehicular ad hoc networks (VANETs) aims at improving communication efficiency by summarizing information that is exchanged between vehicles. Summaries are calculated, while data items are generated in and forwarded through the network. Due to this vehicular networks are special types of VANET that support diverse infrastructure-based commercial services including internet access, real-time traffic management, video streaming, and content distribution. The success of network acquisition and delivery system depends on their ability to defend against the different types of security and privacy attacks that exist in VANETs. In this research work different protocols like AODV, Q-Learning approach and cryptographic approach that being used in VANET have been studied and their performance has been then evaluated by providing a real time environment on NS2.

Wimax is Wireless Interoperability for Microwave Access for Wireless Communication IEEE 802.16e. In this paper the performance of different modulation techniques (QAM, adaptive and QPSK) by using different mobility patterns for VOD over Wimax with the help of VOD SVC coding. The work is done in terms of throughput, traffic sent and traffic received using OPNET modeler 14.5. Simulation shows that when nodes are moving through SVC coding in Wimax, the result is best and the overall performance of QPSK technique is superior to other techniques.

VANET is a vehicular ad hoc network. This is a part of mobile ad hoc network. VANETs also called as intelligent transportation system (ITS) in which vehicles convey to give auspicious data. Their point is to give security, information and management of network. Rather than of their numerous advantages vehicular network is inclined to various attacks. Like prankster attack, denial of service attack, black hole attack, alteration attack, fabrication attack, man in the middle attack, timing attack, illusion attack and so forth. In this research we will attempt to uproot Sybil attack in which node creates its multiple identities and it can be affected by various ways. In previous research researcher judge the estimated physical measurement on the bases of three parameter but it may also be the case that message delay occur due to various another reasons like queue problem, congestion problem, accidental problem, so this approach is not accurate due to absence of GPS. According to this work GPSR protocol will be used through which physical measurement of vehicle can be verified at any time and GPS coordinates will be compared. If GPS coordinate matched then there is no attack.