How do packets go through software bridg?

Question

linux

If we have two adapters, virtual and physical, are included in bridg
Packets go from virtual to physical through a switch or without leaving the system.
Where does this question come from:
1) there was an experience, disconnected the physical adapter from the switch and vm stopped seeing the hypervisor over the network.
2) The hypervisor in the DC, vm on it accesses the database (almost no load 25-40qps) which on the same hypervisor for an hour hardly passes requests to the database, there was a suspicion that the network was overloaded.

Answer 1

Are the IP addresses of the virtual machine and the host on the same network or on different ones?