Network simulator software emulates network topologies to allow for experimentation of different network devices and connections; system testing; or as part of Cisco certification preparation courses. Such simulators may prove helpful tools. GNS3 is a free and open-source network simulation platform. Built on Python, Dynamips emulates Cisco technologies for simulation purposes. However, setting it up may require technical knowledge.
GNS3
GNS3 (Graphical Network Simulator) is a free network simulation software program which utilizes Dynamips to emulate Cisco hardware. Additionally, GNS3 also supports other vendors' devices; in particular it can run IOS images directly from routers and switches - an extremely helpful feature when studying for CCNA certification exams.
GNS3 stands out from Cisco Packet Tracer as it's open source and easily modified to support new devices, featuring an easy graphical user interface for convenient use. Ideal for students and professionals looking to gain experience before taking an official Cisco exam. OPNET, another widely used network simulator, is easy to use and offers many features, but does not allow as much flexibility for testing different network topologies.
Cisco Packet Tracer
Cisco Packet Tracer is one of the most powerful network simulation programs for students. Easily managed, without high infrastructure costs and easily installed on Windows PCs - Cisco Packet Tracer supports MCU, SBCs, IE 2000 industrial switches as well as virtual machine management services.
The program allows students to logically build a network topology and practice configuration before working in a real-world setting. Furthermore, two operating modes mimic real-world hardware - Real-time mode emulates real-time responses to network activities while data transmission remains its focus. Lack of visual feedback in an active topology can be frustrating and result in costly errors like saving and reloading configuration files which could create havoc in production environments.
Boson NetSim
Boson NetSim is a network simulator with guided labs designed to prepare you for Cisco certification exams. The simulator simulates hardware and IOS to deliver accurate behavior such as switches and Layer 2. Furthermore, you can compare your configuration against expected outcomes which allows for the tracking of mistakes as well as pinpointing areas for improvement.
NetSim's device customization feature is intuitive and draws inspiration from GNS3. For instance, NetSim lists out which modules may be added to a network device in its simulation. Furthermore, this software makes rearranging topologies easy. However, NetSim does not support all the same features found in Packet Tracer, such as multiarea OSPF routing or providing an interactive way to trace packet paths across virtual networks.
EVE-NG
Network Simulation Software enables you to emulate and test network devices without incurring expensive equipment purchases. Furthermore, it helps troubleshoot networks faster while solving problems more quickly - an invaluable asset when studying for Cisco certification exams such as CCNA or CCIE certification exams.
GNS3 is an accessible network simulator built using Dynamips that is designed to simulate networking hardware. Capable of supporting a variety of routers and switches as well as many network protocols, GNS3 can be run on various platforms such as Linux or Mac. Boson NetSim and VIRL provide more advanced network simulation features but require extensive technical knowledge for setup. Furthermore, these tools may incur costs over time as subscription services; additionally they may not support all versions of Cisco hardware.
VIRL
VIRL, commonly referred to as Virtual Internet Routing Lab, is a network simulator featuring various Cisco routers, switches, access points and other networking devices. With its advanced features VIRL offers students and professionals alike a useful learning tool. This program allows direct connection to any device's console port or external interface through Telnet and SSH, and supports graphical traceroutes and Pings as well as configuring its interfaces, routing schemes, etc. You can even set up routing with ease using its GUI!
However, this software does have its limitations. Notably, it fails to provide adequate feedback regarding topology during simulation and consumes considerable computer resources - potentially making it challenging for novice users. Yet despite these obstacles, this tool remains an excellent option for students and professionals seeking certification.