What is GNS3? and What does GNS3 do? – The GNS3 is a simulation program supported Open Source Software. You can download freely. It is free fully. And, there are the blog submitting a unlimited support.What is GNS3? and What does GNS3 do?

What is GNS3?

What is GNS3? What does GNS3 do?

Do you have any idea about the [ What is GNS3 ? ]. The GNS3 allows to create a network context your computer. It’s provides that we can run the real Cisco İOS in a virtual context by using the Dynamips program. GNS3 can be installed on the Windows, Mac OS X, Linux, Unix, FreeBSD operating systems.

The GNS3 simulation program is used by the students working to the more Cisco Certified Network Associate (CCNA) and Cisco Certified Network Professional (CCNP) exams or people want to develop their in the network design.

Therefore, it’s used mostly with Cisco network devices. Also, it supports the Juniper, Mikrotik and Vyatta network devices.

Christophe Fillot is the founder of the Dynamips (MIPS Processor Emulation Program) program, which helps the run of Cisco Router operating system. The founder of GNS3 is Grossman.

What does GNS3 do?

After the “what is GNS3” title, let’s explain what does GNS3 do. GNS3 uses as a real Cisco IOS the Cisco Image by using the back-end Hypervisor program IOS that you downloaded rather than the other network simulation programs like RouterSim, Boson NetSim, and VIRL. Other network simulation programs run as the ready draft. So, it provides to make network design as if using a real router.

What is GNS3? and What does GNS3 do?

You can create to their network design by making much the project without needing to the Internet connection with network devices or without Cisco network devices.

We can be included to our their network with virtualization programs the network we created. And then, we can able to take out to the Internet as well.

It supports most Cisco Router and PIX Firewalls platforms, as well as creating simple or complex network designs. We can also monitor the network traffic using the Wireshark program.
If we mention from the Cisco Router Images, it’s important to us the amount of RAM and the IDLE-PC values.

The Amount of Minimal RAM: There are the standard values for Cisco IOS image. For example, 128MB. If we want to increase, we can increase.

IDLE-PC Value: Dynamips will help us consume less than the CPU. And, the compatible value will be specified as (*).

What is Cisco SDM? or What is Cisco Security Device Manager (SDM)? I recommend to you read the topic called “How to Install Cisco Security Device Manager (SDM)?

Component Terms of GNS3

  • GNS3 → GUI (Graphical User Interface).
  • Dynamips → Emulator for IOS.
  • Dynagen → Back-end Beginner for Dynamips.
  • Qemu → Cisco PIX Firewall Emulator based on Qemu.
  • (Win)Pcap → Package Capture Library (Driver for Sniffer).
  • Wireshark (Old Name: Ethereal) → Network Monitoring.
  • VPCS → Virtual PCs (Virtual Computer) → Adding virtual computer on the GNS3 without adding the virtual computer to topology.
  • VMware VMS → VMware Virtual Machines → Including virtual machines topology with VMware Workstation.
  • VirtualBox VMS → VirtualBox Virtual Machines → Including virtual machines topology with VirtualBox.
  • IOU Devices → It’is a real switch (L2/L3) in the GNS3.

In earlier versions, we could not add a real switch device. And we could not do VLAN configuration. We could only do this with a few adjustments. But we could only use it as a simple switch. Now, we can use L2 and L3 switches with more advanced features in GNS3 1.4.6 no longer. It is possible to do this in IOU Devices settings.

Why GNS3 Must We Use?

After we explained “What is GNS3? and What does GNS3 do?”, Why GNS3 Must We Use? It costs us a lot to build a real lab by paying the world for Cisco devices to prepare for the Cisco exams or improve ourselves.Instead of this, we can find the Cisco IOS image on the Cisco site or on the Internet with a couple of searches and work with the GNS3 program to design a network with multiple types of routers on our computer. That’s why we must use GNS3!

How to Install GNS3 on Windows 10 ⇒ Video

You can watch how to install GNS3 on Windows 10 and also subscribe to our YouTube channel…

  Final Word

I wanted you to explain the [ What is GNS3? and What does GNS3? ] subject. After giving general information about GNS3. I tried to give information about what it does. I hope it helps you the “what is GNS3” article.

If this article is helpful, send me feedback by commenting! Thanks in advance, take care of yourself!

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