How to set up access between computers on the same network?

Question

Computer networks

Hello, there is an Internet network that goes to it through mikrotik, from it to level 2 switches (managed). On mikrotik, all interfaces are combined into a bridge. The problem is that some computers cannot communicate with others. The situation is this, there are two cabinets I ping computers from one to the other, 3 work, 1 does not, and in the third it does not work with more than one. Each office has an unmanaged switchboard. Policies or permissions may have been set. Tell me what can block the connection between them. Everyone has access to the Internet, to a local server too. I suspect PC settings.

Answer 1

in win10, for example, pings are dropped by default. Firewall checked on devices?

Answer 2

Most likely the matter is in the firewall, as Ruslan-Strannik wrote .
Try on the computer that does not respond, check the firewall settings.