Implementation Manager (IM) Specialist CHTS Practice Test

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In the OSI Model, which layer is known for ensuring reliable transport of data segments?

Physical Layer
Transport Layer
Network Layer
Data Link Layer

The correct answer is: Transport Layer

The Transport Layer is responsible for the reliable transport of data segments in the OSI Model. It ensures that data are delivered error-free, in sequence, and without losses or duplicates. This layer functions by establishing end-to-end communication between devices, utilizing protocols like TCP (Transmission Control Protocol) which provides reliability through mechanisms such as flow control, error recovery, and retransmission of lost packets. Hence, the Transport Layer is crucial for managing the integrity of data communication, making it the correct answer in this scenario. Other layers in the OSI Model have different primary functions: the Physical Layer focuses on the transmission of raw bits over a physical medium, the Network Layer is responsible for determining the best path for data packets across networks, and the Data Link Layer works to establish and control the communications between adjacent network nodes. Each layer plays a vital role in the overall data communication process, but only the Transport Layer emphasizes reliable delivery, which is why it stands out in this context.