(ISC)2 Certified in Cybersecurity Practice Exam

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How many layers does the TCP model have?

  1. A) 2

  2. B) 1

  3. C) 4

  4. D) 7

The correct answer is: C) 4

The TCP model, also known as the TCP/IP model or Internet protocol suite, consists of four layers. These layers are: 1. **Link Layer**: This layer is responsible for the physical transmission of data and manages how data is physically sent over the network. It includes network hardware components and protocols that manage the connections to the physical medium. 2. **Internet Layer**: The primary function of this layer is to route packets of data from the source to the destination across multiple networks. It includes protocols such as the Internet Protocol (IP), which is essential for addressing and routing. 3. **Transport Layer**: This layer provides end-to-end communication services for applications. It ensures complete data transfer and includes protocols such as Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). 4. **Application Layer**: This is the highest layer in the TCP model, and it provides protocols that allow software applications to communicate over the network. Examples of protocols in this layer include HTTP, FTP, and SMTP. Each layer is designed to communicate with the layers directly above and below it, providing a modular approach that enables efficient networking and data exchange. The four-layer structure facilitates understanding how different aspects of communication are handled, allows for independence between protocol layers