August 2025
Intermediate to advanced
272 pages
6h 14m
English
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Connection States
TCP connections can be in one of three general phases: establishing the connection, transferring data, or terminating the connection. Let’s take a look at these.
Connection Establishment
TCP connections are established through a three-step handshake. Establishing a connection requires a server listening on a bound port. Once that passive listener is in place, the handshake goes as follows:
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The client sends a SYN (for synchronize) to the server, asking to establish a connection. The SYN contains a sequence number that the client sets to a random number A.
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To accept the connection, the server responds with a SYN-ACK. It sets the acknowledgment number to A + 1 and the sequence number of the SYN-ACK packet to a different random ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.