ISC2 Exam ISSAP Topic 1 Question 27 Discussion

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).