Cisco IOS IP Application Services Configuration Guide, Release 12.4 - Configuring TCP Performance Parameters [Cisco IOS Software Releases 12.4 Mainline] - Cisco Systems
The Transmission Control Protocol (TCP) is a protocol that specifies the format of data and acknowledgments used in data transfer. TCP is a connection-oriented protocol because participants must establish a connection before data can be transferred. By performing flow control and error correction, TCP guarantees reliable, in-sequence delivery of packets. It is considered a reliable protocol because if an IP packet is dropped or received out of order, TCP will request the correct packet until it receives it.
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