Which
of the following protocols supports encapsulation of encrypted packets in secure wrappers that can
be transmitted over a TCP/IP connection?

A.
PPTP

B.
UDP

C.
IPSec

D.
PAP

Explanation:
Point-to-Point Tunneling Protocol (PPTP) is a remote access protocol. It is an extension
of the Point-to-Point Protocol (PPP). PPTP is used to
securely connect to a private network by a remote client using a public data network, such as the
Internet. Virtual private networks (VPNs)

use the tunneling protocol to enable remote users to access corporate networks securely across the
Internet. PPTP supports encapsulation of
encrypted packets in secure wrappers that can be transmitted over a TCP/IP connection.
Answer option D is incorrect. Password Authentication Protocol (PAP) is the least sophisticated
authentication protocol, used mostly when a
client calls a server running an operating system other than Windows. PAP uses plain text
passwords.
Answer option B is incorrect. User Datagram Protocol (UDP) is often used for one-to-many
communications, using broadcast or multicast IP
datagrams. Microsoft networking uses UDP for logon, browsing, and name resolution. UDP is a
connectionless and unreliable communication
protocol. It does not guarantee delivery, or verify sequencing for any datagram. UDP provides faster
transportation of data between TCP/IP
hosts than TCP.
Answer option C is incorrect. Internet Protocol Security (IPSec) is a standard-based protocol that
provides the highest level of VPN security.
IPSec can encrypt virtually everything above the networking layer. It is used for VPN connections
that use the L2TP protocol. It secures both
data and password.
IPSec cannot be used with Point-to-Point Tunneling Protocol (PPTP).