Peter works as a Network Administrator for Net World Inc. The company wants to allow remote
users to connect and access its private network through a dial-up connection via the Internet. All the
data will be sent across a public network. For security reasons, the management wants the data sent
through the Internet to be encrypted. The company plans to use a Layer 2 Tunneling Protocol (L2TP)
connection. Which communication protocol will Peter use to accomplish the task?

A.
IP Security (IPSec)

B.
Microsoft Point-to-Point Encryption (MPPE)

C.
Pretty Good Privacy (PGP)

D.
Data Encryption Standard (DES)

Explanation:
According to the question, all the data will be sent across a public network. Data sent
through a public network such as the Internet should

be encrypted in order to maintain security.
The two modes available for data encryption are Microsoft Point-to-Point Encryption (MPPE) and IP
Security (IPSec). The MPPE protocol is used
for data encryption in a PPTP connection. It supports MSCHAP v1 and v2, and the EAP-TLS
authentication methods. However, L2TP does not
support the MPPE protocol. Therefore, for an L2TP connection, Peter will have to use the IPSec
protocol to encrypt data. L2TP with IPSec
needs a certificate authority server (CA server) to generate certificates as well as to check their
validity for providing secure communication
across both ends of the VPN.