Which of the following is a standard-based protocol that provides the highest level of VPN
security?
A.
L2TP
B.
IP
C.
PPP
D.
IPSec
Explanation:
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).
Answer option B is incorrect. The Internet Protocol (IP) is a protocol used for communicating data
across a packet-switched inter-network using the Internet Protocol Suite, also referred to as
TCP/IP.IP is the primary protocol in the Internet Layer of the Internet Protocol Suite and has the
task of delivering distinguished protocol datagrams (packets) from the source host to the
destination host solely based on their addresses. For this purpose, the Internet Protocol defines
addressing methods and structures for datagram encapsulation. The first major version of
addressing structure, now referred to as Internet Protocol Version 4 (IPv4), is still the dominant
protocol of the Internet, although the successor, Internet Protocol Version 6 (IPv6), is being
deployed actively worldwide.
Answer option C is incorrect. Point-to-Point Protocol (PPP) is a remote access protocol commonly
used to connect to the Internet. It supports compression and encryption and can be used to
connect to a variety of networks. It can connect to a network running on the IPX, TCP/IP, or
NetBEUI protocol. It supports multi-protocol and dynamic IP assignments. It is the default protocol
for the Microsoft Dial-Up adapter.
Answer option A is incorrect. Layer 2 Tunneling Protocol (L2TP) is a more secure version of Pointto-Point Tunneling Protocol (PPTP). It provides tunneling, address assignment, and
authentication. It allows the transfer of Point-to-Point Protocol (PPP) traffic between different
networks.L2TP combines with IPSec to provide tunneling and security for Internet Protocol (IP),
Internetwork Packet Exchange (IPX), and other protocol packets across IP networks.