Network Fundamentals Simulator

TCP handshake & state machine

Click Next to walk through a full TCP connection — open, one data byte, then a graceful close. Sequence and acknowledgment numbers update in real time. Both endpoints\' states light up as they change.

Step: — idle —

TCP segment on the wire

Click Next to send the first SYN…

What this step does

TCP connection begins when the client sends a SYN with its initial sequence number. The server is passively LISTENing.

seq(client) = — · ack(client) = —
seq(server) = — · ack(server) = —

Practice — quick check

Score: 0 / 0

Question

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