What are GNS3-all-in-one and GNS3-VM

CCNA/CCNP exam syllabus includes many topics you need to perform on Cisco routers and switches. Cisco routers and switches are expensive. A CCNA lab with only essential hardware may cost you at least $1000. You can save this money by using GNS3.

GNS3 is open-source and free software. It allows you to emulate, configure, test, and troubleshoot Cisco devices in a virtual lab environment. You can use it to build a virtual lab to practice CCNA/CCNP exam topics.

How GNS3 works

GNS3 uses a client/server model. It consists of two components: the GNS3-all-in-one software and the GNS3 server. GNS3-all-in-one is the client part of GNS3 that you install on your local computer. It provides a graphical user interface for creating and testing topologies. The GNS3 server is the server part of GNS3. It stores and runs all the devices you use on the client side.

You have three options to install the GNS3 server.

1. Install the GNS3 server on the local computer as an application.
2. Create a virtual machine on the local computer and install the GNS3 server on it.
3. Create a virtual machine on a remote server and install the GNS3 server on it.

The option you choose depends on your requirements and system configuration.
The first option is the easiest. It does not need any additional configuration. If you want to create only small networks or add only a few Cisco devices to your network, use this option. This setup requires less hardware configuration but supports only a limited number of devices.
The second option needs additional configuration and a virtual machine. If you want to create advanced networks or add many Cisco devices to your network, you can use this option. This setup supports all the devices you need to practice CCNA/CCNP exam topics, but it needs more hardware configuration. To use this option, you need a laptop or a desktop with at least a dual-core processor, 8GB RAM, and 40GB of free disk space.
The third option is the most complex. If you want to create large networks or add devices from multiple vendors, you can use this option. Administrators use this option to test their networks. This setup is not required to practice CCNA/CCNP exam topics.

If you want to use GNS3 to practice CCNA/CCNP exam topics, the second option is the best. If your computer meets the minimum required configuration, use the second option to install GNS3. If your computer does not meet the minimum requirements, you can use the first option to install GNS3.

Virtual devices on GNS3

GNS3 supports two methods to create virtual devices. These methods are emulation and simulation. In the first method, GNS3 creates an exact virtual copy of the physical device. In the second method, GNS3 creates a virtual copy of some selected features and functions of the physical device.

If you choose the first method, you need to supply IOS image files to GNS3. An IOS image file is an operating system for Cisco devices. If you choose the second option, you do not need to provide any IOS image files to GNS3. GNS3 automatically installs the necessary operating system on simulated virtual devices.

You can use the second method to create only essential networking devices for testing and troubleshooting. To practice CCNA/CCNP exam topics, you also need advanced devices such as routers and switches. To create advanced devices, you must use the first method.

Key points

• GNS3 is open source and free software.
• GNS3 allows you to create a virtual lab to practice CCNA/CCNP exam topics and questions.
• You can emulate or simulate many routers, switches, and other networking devices in the GNS3 virtual lab.
• GNS3 has two components: the GNS3 client and the GNS3 server.
• GNS3 client is known as GNS3-all-in-one. It provides a GUI for creating, configuring, testing, and troubleshooting virtual networks. You need to install it on the local system.
• The GNS3 server is known as the GNS3 VM. It stores and runs all virtual devices. You can install the GNS3 server directly on the local system as an application, or create a virtual machine and install it there.
• If you install the GNS3 server on a virtual machine, you have two options for saving the virtual machine. You can save the virtual machine on a local or remote system.

Conclusion

GNS3 is a powerful and versatile tool that enables users to create a virtual networking lab for practicing and mastering CCNA and CCNP exam topics. It has two main components: GNS3-all-in-one as the client interface and GNS3-VM as the server. It supports three types of installation. You can choose the installation method that best fits your needs and system capabilities. Whether you opt for a straightforward local installation or a more complex setup using remote virtual machines, it can fulfill your requirements from simple topologies to extensive networks with multiple vendor devices.