Abstract
The aim of this paper is to evaluate the performance of LAN and VLAN networks in different scenarios, measuring performance metrics like traffic sent, traffic received, delay and collision count in the Ethernet environment. The simulation was carried out using OPNET IT GURU ACADEMIC EDITION 9.1. To observe the performance of LAN and VLAN networks three different scenarios were presented. In the first scenario, the network consists of one hub and 16 workstations; the second scenario was connected with two hubs and a switch while the third scenario VLAN is explained and detailed, the simulation results displayed that more traffic exists in the network without VLANs, since any communication between departments is allowed, when using VLANs; it is no more possible to send traffic or access the network resources of other departments, VLANs improve the bandwidth utilization, security and the administration by supporting a virtual organization.
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