The Transport Layer (e.g TCP) provides reliable delivery of Data by using error checking, acknowledgments, flow control, and sequence checking. Multiplexing of incoming data for different flows to applications on the same host (for example, TCP ports) is also performed. Flow control in this layer ensures that the transmitting device does not send more data than the receiving device can process.
Examples of Layer 4 Specifications and Protocols
• TCP
• UDP
• SPX
• Port Numbers (e.g 80 for HTTP)
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