Farrukh, AlisheyNouman, MuhammadAbdullah, Aqsa2019-02-042019-02-042018https://escholar.umt.edu.pk/handle/123456789/3664Sir Hassan TariqIn this era of fast paced technologies wireless networks have become more desirable for users rather than the wired networks. But, unfortunately it has a drawback of low bandwidth. Despite the fact it is more likely due to mobility, flexibility and it having cheap physical medium (air). Network performance based on IEEE 802.11 have become more popular during this era. For researchers to evaluate the network performance and telecommunication evaluation computer simulation has become a vital tool.[2] Simulation is more preferred as there is more availability of strong simulators and there is built-in flexibility in validation that is offered by the model construction and simulation. There are several network simulators available in the market but OPNET IT Guru is more preferable. [3]OPNET IT Guru enables the easy creation of virtual scenarios and the factors changing with fast and effective outcomes which can definitely carried forward in practical use. There are several factors that affect the network performance of WLAN of which a few are throughput, increased retransmission, propagation delay, network delay, queuing delay, load delay, media access delay, bandwidth and many more. [4]In our paper we will be providing variation in the factor of bandwidth in the provided ranges available on OPNET IT GURU and will be checking its effect caused on the factors of media access delay, load delay and throughput on four technology models which are being used. Our technology models include Frequency hopping, 802.11a, 802.11g and Direct Sequence Spread Spectrum. The number of users will be varied on four technologies and also along the buffer size will be varied and result will be concluded to be evaluated.enApplication Characterization Environment, Advanced Research Projects Agency NetworkBSThesis