Data communication and networking are changing the way we do business and the way we live.The development of the personal computer brought about tremendous changes for business, industry,science and education.A similar revolution is occurring in data communication and networking.Technological advances are making it possible for communication links to carry more and faster signals.As computer networks evolved, it has changed whole idea of communication which provides lot of benefits to the user.Research in data communication and networking has resulted in number of new technologies.One of the most popular technology of computer network is internet.The internet was invented with goal of exchanging data such as text,audio,video and image to any part of world. For interconnectivity between end users, network topology describe the physical appearance and interconnection between arrangement of computers, cables and other component in a data communication network.So we can say network topology is the backbone of any computer network.In this paper, computer networks with different types of topology is implemented and simulated using network simulator NS2