The initial installation of CentOS7, the default network card is not turned on.
cd /etc/sysconfig/network-scripts/
ls to see what the corresponding number after ifcfg-eno is, take eno32 as an example below
vi ifcfg-eno32
under edit
ONBOOT="yes" turns on auto-enable network connection
:wq save and exit
service network restart restart the network
You should be able to see the wired network card!