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Abstract
In this thesis, the concentration will be on the traffic problems on computer networks such as congestion. Congestion occurs when the number of packets being transmitted through a network begins to
approach the packet-handling capacity of the network, and the performance of the network degrades. The objective of congestion control is to maintain the number of packets within the network below the level at which performance fall off dramatically.
A comprehensive survey of urrent ’switching and routing
techniques are presented. This survey has covered in brief details circuit
switching, packet switching using datagram approach and virtual circuit
approach, frame relay, the Asynchronous Transfer Mode (A TM) with -its
main features and Integrated Services Digital Networks (ISDN).
This is besides the routing survey which covered routing types in
WAN which are fixed routing, adaptive routing, flooding and random
routing. This is besides the comparison evaluation of routing techniques
in WAN. Then there is a comparative survey of congestion control
avoidance techniques, flow control, and error control techniques.
The objective of this research is to build a general simulation
model to evaluate and measure the performance of the computer
networks. So, the methods of performance evaluation and the analysis of queuing process will be introduced.
Simulation study is presented to measure the newly proposed scheme and discuss the queuing behavior of A TM cells in output buffers dealing with three types of queues: the MIMIl queue, the MID/l queue, and cell-scale queue.