What VPN tunnel type was developed in cooperation with Cisco Systems and Microsoft, and uses Data Encryption Standard (DES) or Triple DES (3DES)?

What VPN tunnel type was developed in cooperation with Cisco Systems and Microsoft, and uses Data Encryption Standard (DES) or Triple DES (3DES)?

• L2TP/IPsec
• SSTP
• PPTP
• L2TP 

EXPLANATION

In computer networking, Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to support virtual private networks (VPNs) or as part of the delivery of services by ISPs. It does not provide any encryption or confidentiality by itself. Rather, it relies on an encryption protocol that it passes within the tunnel to provide privacy.

A tunneling protocol derived from two older protocols, Cisco's L2F and Microsoft's PPTP. L2TP encapsulates PPP packets and is usually combined with IPSec for improved security.