Qaqos, N.N., Zeebaree, S.R.M. and Hussan, B.K. 2018. Opnet Based Performance Analysis and Comparison Among Different Physical Network Topologies. Academic Journal of Nawroz University. 7, 3 (Jun. 2018), 48–54. DOI:https://doi.org/10.25007/ajnu.v7n3a199.