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    Question

    Which of the following statements about the OSI

    Model’s Transport Layer is true? 
    A It defines how data is formatted for transmission over the physical medium. Correct Answer Incorrect Answer
    B It ensures reliable data transfer through error detection and correction. Correct Answer Incorrect Answer
    C It is responsible for routing data between different networks. Correct Answer Incorrect Answer
    D It provides end-to-end communication and flow control between devices. Correct Answer Incorrect Answer
    E It provides the logical addressing of devices on the network. Correct Answer Incorrect Answer

    Solution

    The Transport Layer (Layer 4) of the OSI model is responsible for providing end-to-end communication, ensuring reliable data delivery, and managing flow control between devices. It uses protocols like TCP and UDP to establish logical communication between processes, handle error detection, and ensure that data is delivered in the correct sequence. This layer also controls the flow of data to prevent congestion. Option A (Defines data formatting): Data formatting is done at the Presentation Layer (Layer 6), not the Transport Layer. Option B (Ensures reliable data transfer): While the Transport Layer does provide reliable data transfer (e.g., using TCP), error detection and correction are done at both the Data Link (Layer 2) and Transport Layer, not solely at Layer 4. Option C (Routing data): Routing is the responsibility of the Network Layer (Layer 3), which is concerned with the logical addressing and forwarding of packets across networks. Option E (Logical addressing): Logical addressing is handled by the Network Layer (Layer 3) using IP addresses, not the Transport Layer.

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