In this thesis, a router emulator, Dynamips, is considered to be cooperated into the Virtual Lab which is a practice environment for Network Management course. Technical problem to accomplish this task will be briefed and solved in this thesis. Students can then extend their practice subject to various topologies network structure in the Virtual Labs without many physical network devices. This helps the efficiency and the effectiveness of learning. The Virtual Labs with the router emulator together, enable student not only can do network management task on the host, but also can do the management task on the network devices. In fact, the virtual routers Dynamips emulated, are totally compatible to those Cisco physical routers provide the same IOS of Cisco routers is loaded. A few examples will show that the proposed Virtual Labs can support all Cisco Network Administration courses, such as CCNA,CCNP, and even CCIE.