GIAC Security Essentials Certification (GSEC) — Question 28

There is not universal agreement on the names of the layers in the TCP/IP networking model. Which of the following is one of the functions of the bottom layer which is sometimes called the Network Access or Link Layer?

Answer options

• A. Provides end-to-end data delivery service for user applications
• B. Handles the routing of the data packets over the network
• C. Manages IP addressing and encryption for data packets
• D. Defines the procedures for interfacing with Ethernet devices

Correct answer: D

Explanation

The correct answer is D because the bottom layer, known as the Link Layer, is responsible for defining how devices interface with Ethernet and other network technologies. Options A, B, and C relate to higher layers in the TCP/IP model, focusing on data delivery, routing, and addressing, which are not functions of the Link Layer.