3-Way Handshake 핸드쉐이크가 이루어 지는 과정 이해하기 SYN SYN-ACK ACK 시퀀스 번호가 교환되는 과정 이해 https://hpbn.co/building-blocks-of-tcp/ https://tools.ietf.org/html/rfc793#page-31 Flow control Congestion control Congestion avoidence https://witestlab.poly.edu/blog/tcp-congestion-control-in-lossy-wireless-networks/