The current researches are moving towards more development in order to provide the
growing the needs of users such as support real-time applications, quality of service,
particularly; the high data rate transfer and other. That prompts the network
service
providers to integrate many properties for different networks resource, and support
providing the service "anywhere and anytime".
Hence, the importance of this research, which aims to study the vertical handover as
very important and necessary step to provide the mobility of mobile nodes between the
different networks by using Media Independent Handover (MIH) IEEE802.21standard
which is developed in January 2009. In this paper, the performance of vertical handover
between these two networks is evaluated taking into account many parameters such as
packet loss, handover latency, and throughput, using NS2 simulator (Network Simulator
version2) which includes a support for MIH technology by the National Institute of
Standard and Technology (NIST).
WLANs have evolved into the best choice in a number of situations such as government institutions and airports, but because of the open transport in these networks increased the possibility of security attacks, which required the use of security prot
ocols to protect the network and to protect users. This research examines and evaluates the impact of security protocols on WLAN performance in order to select the optimal protocol, the impact of these protocols on network performance has been evaluated by adding those Protocols to open source GloMoSim environment, And recent simulation results show that the performance of these protocols are varies according to the environment applied within them, noting that there is no effective Protocol in all environments, i.e. the suitable Protocol in an environment may be unsuitable in other ones. After comparing performance results in simulations with performance results in the real network, we can see that the best performance protocol is WEP. Also, The best protocol for both performance and security is the WPA2. Hence, our choice to one of the security protocols depends on what we want to secure in the level of protection and the performance of the network.
