الفهرس 
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Abstract
The objective is to minimize the collision count that occurs in hubs as much as possible and increasing the number of filtered traffic by switch to obtain the better performance for the network by varying some parameters in the network such as Ethernet cables and Ethernet frame size.
study the effect of the PAN coordinator, ZigBee router and ZigBee End Device failure on the overall Data Traffic Sent, Data Traffic Received, Throughput and Delay then evaluating the effect of these conditions on the network performance to conclude which topology will give me the better performance.