AdventNet Simulation Tool comprises easy-to-use, GUI-based agent simulator and network simulator for testing, training and demonstration of network management applications. The network simulator enables network simulation of 50000+ SNMP (v1, v2c, v3), TL1, TFTP, FTP, Telnet and Cisco IOS devices, on a single PC. It provides the Topology Editor to establish inter-connections across routers, switches and other network devices and visualize the topological relationship between the devices. Simulation Toolkit provides Network Recorder and Trap Recorder to record and replay real SNMP networks and traps and create simulations of actual devices of your network. Devices can be configured at run-time, both on individual and collective basis. The tool allows bulk addition of devices with unique IP address and port , bulK modification of device properties like IP address, port number and MIB values, advanced modeling of agent/network behavior and trap generation, customization of SNMP request/response PDUs. The agent/network management through RMI provides solution for automated testing. Ability to simulate 50000+ agents simultaneously for scalability testing, trap simulation for fault management testing, configuration of device values and simulation types for performance testing, behavior simulation for testing realistic/negative test scenarios across network devices, start/stop of network at runtime, automated network simulation and easy-to-use GUI enables full-fledged simulation of large networks.