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Which of the following is not a matching characteristic of an OSI Transport Layer protocol?
Error recovery
Negotiation of data formats
Multiplexing using port numbers
Flow control
Layer 4 "Transport Layer" focuses on matters related to data delivery in a network, whether is reliable or unreliable communication. Both TCP and UDP protocols support multiplexing using port numbers. While TCP supports error recovery, flow control using windowing, connection establishment (and termination) and data segmentation. Session layer deals with the definition and negotiation of data formats.
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