NETWORKING · TCP
TCP Handshake L4
SYN, SYN-ACK, ACK. Every state, every sequence number.
Scenario · Mode
- chaos -
Sequence Diagram · Full Connection Lifecycle
Client
CLOSED
Server
LISTEN
SYN
SYN+ACK
ACK
PSH+ACK
FIN
RST
dropped
What just happened
What this shows: the 3-way handshake and full TCP lifecycle with real sequence numbers
Use when: debugging connection failures · learning TCP flags · studying TIME_WAIT and FIN
Part of Signal Path I: Browser to Server