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Rick Wagoner IET680 – Lab02 Lab02 was concerned with the utilization and throughput on a Token Ring network. The variables being considered in this lab were the THT (Token Holding Time), the network load, and throughput. We considered each of these items as they related to one another using the ITGuru simulation software. We first checked to see how network utilization and throughput would be affected by using different THT values on the network. The load was balanced meaning that each node was producing an equal volume of the network traffic. Secondly we checked to see how different THT values affected a network that was not balanced. In this situation two nodes were producing a much larger portion of the traffic than the remaining nodes. We then checked to see how the network load being cut in half affected utilization and throughput. Finally we checked to see how the utilization and throughput would be affected by a single node on the network producing all of the traffic and no other node communicating at all. The first simulation showed that the THT value affects the utilization of the network. However this value did not seem to have as great an affect on the throughput of the network. It appears that increasing the THT value reduces the overhead (token passing) on the network and thus allows for greater utilization of the network. Nodes spend more time sending data and less time passing the token. The second simulation was comparable to the first but we changed the arrangement of the network load. No longer did we show an even balance from all nodes but we had two nodes producing a larger portion of the traffic. With this arrangement we could again see that the THT affected the utilization of the network. Again the throughput did not seem to be affected by this value as much. Utilization and throughput were both down in this scenario. We then checked utilization and throughput with only half of the network load. With only half the network load the THT value did not have an affect on either utilization or throughput. In both cases, these values were greatly reduced due to the lower traffic. We only a single node producing a full network node we could again see how a higher THT value would increase utilization. Throughput again was not affected by this as much. A single node producing this load could almost but not quite reach the utilization and throughput levels of a balanced network. THT and network load appear to be the two primary factors influencing a token ring network in this simulation. THT value provided some affect in almost every scenario and network load also provided some variance in utilization and throughput. It appears that a higher THT value allows more time on the network to be used for data traffic instead of token passing giving better utilization. Total throughput appears to be more affected by the total network load.
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