Setting up a VPN is a straightforward process. It's often as simple as entering a username and sever address. The dominant smartphones can configure VPNs using PPTP and L2TP/IPsec protocols. All major operating systems can configure PPTP VPN connections. OpenVPN and L2TP/IPsec protocols require a small open source application (OpenVPN) and certificate download respectively.
This is the IP address that we need of the VPN server. It can also be a fully qualified domain name (FQDN) such as vpn.mycompany.com, depending on how it’s been configured.
All VPN connections have a username and password. These are usually set up for you by your VPN Provider.
There are two types of VPN connections, L2TP and PPTP. Both allow a secure connection, though L2TP is generally found to be the better of the two. This is because, in addition to a username and password, L2TP connections can require ashared secret. This is like a secret passphrase that any VPN users will need to add to their connection.