(ISC)2 Certified in Cybersecurity Practice Exam

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At what layer of the OSI model does TCP and UDP exist?

A) Layer 1 (Physical)
B) Layer 2 (Data Link)
C) Layer 3 (Network)
D) Layer 4 (Transport)

The correct answer is: D) Layer 4 (Transport)

TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) operate at Layer 4 of the OSI model, which is known as the Transport layer. The primary function of the Transport layer is to provide reliable or unreliable delivery of data and to ensure proper segmentation of data for transmission over a network. TCP is a connection-oriented protocol that guarantees the delivery of data packets in the right order and without errors. It is commonly used for applications where data integrity is critical, such as web browsing and file transfers. UDP, on the other hand, is a connectionless protocol that does not guarantee delivery, making it suitable for applications where speed is more crucial than reliability, such as video streaming or online gaming. Understanding that both protocols serve vital roles in managing data transmission between devices is essential for grasping how different layers of the OSI model interact. The correct identification of TCP and UDP at the Transport layer highlights their functions in facilitating communication across a network while maintaining a balance between reliability and performance.