With bridged networking, your computer literally uses traffic from a host computer that receives and sends the traffic from somewhere else.
local network at 192.168.123.1
subnet mask is 255.255.255
+---------+ +-------+ +---------+
| +-----+ +--+bridged+--+ +-----+ |
| | | | | | | |
| | 101 | | | | 100 | +--> Internet
| | | | | | | |
| +-----+ | | +-----+ |
| | | |
| * ===== | | * ===== |
+---------+ +---------+
localhost normality