Which of the following statements pertaining to VPN protocol standards is false?

A.
L2TP is a combination of PPTP and L2F.

B.
L2TP and PPTP were designed for single point-to-point client to server communication.

C.
L2TP operates at the network layer.

D.
PPTP uses native PPP authentication and encryption services.

Explanation:
The Layer 2 Tunnel Protocol (L2TP) is an emerging Internet Engineering Task
Force (IETF) standard that combines the best features of two existing tunneling protocols: Cisco’s
Layer 2 Forwarding (L2F) and Microsoft’s Point-to-Point Tunneling Protocol (PPTP). L2TP is an
extension to the Point-to-Point Protocol (PPP), which is an important component for VPNs. VPNs
allow users and telecommuters to connect to their corporate intranets or extranets. VPNs are costeffective because users can connect to the Internet locally and tunnel back to connect to corporate
resources. This not only reduces overhead costs associated with traditional remote access
methods, but also improves flexibility and scalability.
PPTP and L2TP are Layer 2 tunneling protocols; both encapsulate the payload in a Point-to-Point
Protocol (PPP) frame to be sent across an intermediate network.