References
Now that we have gone through the chapter, let's take a look at the references used:
Firewalld configuration guide: https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7
OpenVPN server overview: https://openvpn.net/index.php/access-server/overview.html
BIND DNS server page: https://www.isc.org/downloads/bind/
Web server (LAMP) wiki page: https://en.wikipedia.org/wiki/LAMP_(software_bundle)
FTP server Wiki page: https://en.wikipedia.org/wiki/File_Transfer_Protocol
FTPS vs SFTP: https://www.eldos.com/security/articles/4672.php?page=all
Mod_SSL
for Apache documentation: http://www.modssl.org/docs/OpenSSL webpage: https://www.openssl.org/