At what layer does TCP operate?

#TCP operates at the OSI transport layer (layer 4).

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#Detailed explanation

TCP (Transmission Control Protocol) is a protocol that provides:

• reliable data delivery
• connection establishment (3-way handshake)
• segment order control
• error control
• flow and congestion control
• working with ports

All these functions correspond exactly to the OSI transport layer - L4 (Transport Layer).