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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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