How to build a virtual laboratory for Cisco?

Question

Computer networks

Took ship with Cisco on board. The last time I tried such an animal with my hands was 8 years ago. In order not to upset the delicate balance of the system, I want to emulate my network and try to spin it first.
I tried to put Packet Tracer, but I had problems finding ios to repeat the existing network.
Also, I heard that there is some other software like Packet Tracer, but it also needs ios of the necessary systems.
If anyone has the opportunity to put the following ios in some kind of revenge:

• 2960 12.2(35)SE5
  
• 2960G 12.2(35)SE5
  
• 3750 12.2(35)SE5
  
• 5510 7.0(8)
  
• 2851 12.4
  
• 871 12.4
  

I will be very grateful
P.S> there will be an opportunity to lay out the latest versions of ios for these devices, in addition to the versions indicated above, it would be very great.

Answer 1

There is a more productive analogue of GNS3 - www.unetlab.com

Answer 2

Так же, слышал, что есть еще какая то софтина типа Packet Tracer, но для нее так же нужны ios нужных систем.

GNS3. Маленький нюанс - там нет коммутаторов.
Образы.
Я не думаю, что нужны образы именно этих (указанных вами) устройств. На то она и эмуляция)

Answer 3

Предлагаю начать так
blog.netskills.ru/p/cisco-packet-tracer.html
blog.netskills.ru/p/gns3.html