Why can't computers on different networks communicate?

Question

Computer networks

Dratuti))0
We have 2 computers with ip from different networks (for example, PC1 - 192.168.1.2, and PC2 - 27.83.31.2), which are connected to the switch.
Question: why can't they interact? I understand that this is because they are from different networks, but I'm interested in the details. For example, broadcast traffic runs between them. And the switch does not care about ip at all. It turns out that the packets are dropped by computers?

Answer 1

assign ip 27.83.31.3 to a computer with ip 192.168.1.2 as an additional one, then it will receive packets from this network.
each ip has a mask at 192.168.1.0 the mask is 255.255.255.0 - this means that the ip can be from 192.168.1.0 to 192.168.1.255 , but 0 and 255 are service addresses. All other addresses will not be processed by the TCP/IP subsystem - 255.255.255.255 broodcast and 224.0.0.0/24 multicast exceptions

Answer 2

Packets are not dropped by computers, they just don't know each other exists. it's like telling you to go on foot to city N. you say - give me a map - and I'll get there. So, in order for a packet from one subnet to reach another, it needs a map or a "route" ..
routers serve to combine different subnets into one - it doesn't matter if they are software static routes or a network piece of hardware ..