https://wiki.archlinux.org/index.php/Network_configuration
https://coreos.com/blog/intro-to-systemd-networkd/

Net via systemd-networkd:
https://wiki.archlinux.org/index.php/Systemd-networkd

man systemd-network

Example 1. /etc/systemd/network/50-static.network
[Match]
Name=enp2s0

[Network]
Address=192.168.0.103/24
Gateway=192.168.0.1
DNS=192.168.0.1
#end

sudo systemclt enable systemd-networkd.service
sudo systemctl enable systemd-resolved.service

After restart
ip route list
default via 192.168.0.1 dev enp2s0  proto static 
...
192.168.0.0/24 dev enp2s0  proto kernel  scope link  src 192.168.0.103 


NetworkManager defaults:
ip route:
default via 192.168.0.1 dev enp2s0  proto static  metric 100 
192.168.0.0/24 dev enp2s0  proto kernel  scope link  src 192.168.0.103  metric 100 

ip address:
2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 94:de:80:7d:b2:15 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.103/24 brd 192.168.0.255 scope global dynamic enp2s0
       valid_lft 4332sec preferred_lft 4332sec
    inet6 fe80::96de:80ff:fe7d:b215/64 scope link 
       valid_lft forever preferred_lft forever