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    Question

    Which of the following protocols does NOT operate at the

    transport layer of the OSI model?
    A TCP Correct Answer Incorrect Answer
    B UDP Correct Answer Incorrect Answer
    C ICMP Correct Answer Incorrect Answer
    D SCTP Correct Answer Incorrect Answer

    Solution

    ICMP (Internet Control Message Protocol) is a network layer protocol used for error reporting and diagnostic functions. TCP, UDP, and SCTP operate at the transport layer.

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