Which of the following are the differences between PPTP and L2TP?

L2TP does not provide any kind of security.

PPTP connections use Microsoft Point-to-Point Encryption (MPPE), whereas L2TP uses Data Encryption Standard (DES).

L2TP may be used with IPSec, while PPTP stands alone.

PPTP is supported by most industry vendors, while L2TP is a proprietary Microsoft standard.