A STUDY OF COMPUTER NETWORKS PERFORMANCE AND SECURITY
WALEED MOHAMMED BAHGAT;
Abstract
Studying the performance characteristics of a LAN before putting it into use is very important for network designer to adjust various parameters of the network at the planning stage. This way the designer eliminates the risk of unforeseen bottlenecks, underuse or overuse of resources, and failure to meet targeted system requirements.
The common approaches to performance evaluation apply
analytical models, simulation models, or hybrid models. Simulation models allow system analysts to evaluate the performance of existing or proposed systems under different conditions that lie beyond what analytic model can handle. Unlike analytical ll1odels, simulation model can provide estimates of virtually any network performance measure.
There is some factors affecting the network performance like, •the transmission rate, number of stations, packet length and traffic intensity. The term network performance means studying the effect of such factors on the network delay (the time spent from one station start to send a message to another station till the other station receives this message).
Four network protocols (token ring, token bus, CSMA/CD and star) are investigated in this thesis. Numerical results are performed for each protocol using both analytic and simulation models. A comparison study is carried out between the numerical results for the four protocols to conclude the difference between them and the best protocol to use according to the given network parameters. Comparison study is also conducted between the numerical results of the simulation model and analytical model for each protocol, to show the validity of the simulation model.
Moreover theoretical performance analysis for the CSMA/CA as it is used in IEEE802.11 wireless LANs is carried out.
The common approaches to performance evaluation apply
analytical models, simulation models, or hybrid models. Simulation models allow system analysts to evaluate the performance of existing or proposed systems under different conditions that lie beyond what analytic model can handle. Unlike analytical ll1odels, simulation model can provide estimates of virtually any network performance measure.
There is some factors affecting the network performance like, •the transmission rate, number of stations, packet length and traffic intensity. The term network performance means studying the effect of such factors on the network delay (the time spent from one station start to send a message to another station till the other station receives this message).
Four network protocols (token ring, token bus, CSMA/CD and star) are investigated in this thesis. Numerical results are performed for each protocol using both analytic and simulation models. A comparison study is carried out between the numerical results for the four protocols to conclude the difference between them and the best protocol to use according to the given network parameters. Comparison study is also conducted between the numerical results of the simulation model and analytical model for each protocol, to show the validity of the simulation model.
Moreover theoretical performance analysis for the CSMA/CA as it is used in IEEE802.11 wireless LANs is carried out.
Other data
| Title | A STUDY OF COMPUTER NETWORKS PERFORMANCE AND SECURITY | Other Titles | دراسة الاداء والسرية فى شركات الحاسبات | Authors | WALEED MOHAMMED BAHGAT | Issue Date | 2002 |
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