The wired Computer Networks provide a secure and faster means of connectivity but the need of mobility i.e. anywhere, anytime and anyone access is tilting the network users towards wireless technology. In this paper, an overview of the current research literature, in the field of Wired and wireless networks, has been presented. The network simulators provide an ease in predicting and estimating the performance of networks. Among the various network simulators available,OPNET gains an edge in analysing the performance of the networks through simulations. The metrics like throughput,delay and retransmission attempts have been overviewed for performance analysis of the wireless and wired computer networks using soft computing techniques like simulation through OPNET.