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Networkd units can contain secrets. In future also wireguard vpn will be supported by networkd. To avoid leakage of private keys, those could be then also put outside of the /nix/store Having a writeable /etc/systemd/network also allows to quick fix network issues, when upgrading `nixos-rebuild switch` would require network on its own (due updates).
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.