(ISC)2 Certified in Cybersecurity Practice Exam

What does the TCP/IP model specify?

1. Three layers of functionality

2. Five layers of application security

3. Four layers of functionality

4. Two layers of encryption

The correct answer is: Four layers of functionality

The TCP/IP model, also known as the Internet Protocol Suite, specifies four layers of functionality that are critical for the communication processes in a network. These layers are: 1. Application Layer: This is where user applications and processes reside, facilitating end-user services such as email, file transfer, and web browsing. 2. Transport Layer: Responsible for end-to-end communication services for applications, it includes protocols like TCP and UDP that manage data delivery, flow control, and error checking. 3. Internet Layer: This layer handles packet forwarding, including routing through intermediate routers. The primary protocol here is the Internet Protocol (IP). 4. Network Interface Layer: This layer includes the physical and data link layer functions, specifying how data is physically transmitted over the network medium. Understanding these four layers is crucial, as they form the backbone of how data is transmitted across networks. Each layer has distinct responsibilities, contributing to the overall functioning of the networking process. This layered approach allows for interoperability among various types of hardware and software, ultimately providing a robust framework for data transmission and communication.