GIAC Exam GSEC Topic 9 Question 25 Discussion

Internet Protocol Security (IPSec) is a standard-based protocol that provides the highest level of VPN security. It is used for VPN connections

that use the L2TP protocol. It secures both data and passwords. IPSec operates at the network layer of the Open Systems Interconnect (OSI)

model.

Answer option A is incorrect. The physical layer is responsible for packaging and transmitting data on the physical media. This layer conveys

the bit stream through the network at the electrical and mechanical level.

Answer option C is incorrect. The data-link layer is responsible for error free transfer of data frames. This layer provides synchronization for

the physical level.

Answer option D is incorrect. The session layer establishes a communication session between processes running on different communication

entities in a network and can support a message-mode data transfer.