Why does a confirmation need to be sent at the end when establishing a TCP connection?

A confirmation must be sent at the end of establishing a TCP connection because it is necessary to prevent the expired connection request segment from suddenly being transmitted to the TCP server to avoid errors. TCP, the Transmission Control Protocol, is a connection-oriented, reliable A transport layer communication protocol based on byte streams.

This is mainly to prevent the invalid connection request segment from suddenly being transmitted to the TCP server to avoid errors.

Introduction to TCP:

Transmission Control Protocol (TCP, Transmission Control Protocol) is a connection-oriented, reliable, byte-based Streaming transport layer communication protocol, defined by IETF's RFC 793.

TCP is designed to accommodate a layered protocol hierarchy that supports multiple network applications. TCP is relied upon to provide reliable communication services between pairs of processes in a host computer connected to different but interconnected computer communication networks. TCP assumes that it can obtain simple, possibly unreliable datagram services from lower-level protocols. In principle, TCP should be able to operate on top of a variety of communications systems, from hardwired connections to packet-switched or circuit-switched networks.

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