On 2/22/20 4:50 PM, home user wrote:
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000 link/ether 52:54:nn:nn:nn:nn brd ff:ff:ff:ff:ff:ff inet 192.168.nnn.n/nn brd 192.168.nnn.nnn scope global virbr0 valid_lft forever preferred_lft forever
This is the virtual network used for virtual machines. libvirtd is enabled by default.