September 2017
Intermediate to advanced
466 pages
9h 33m
English
Content preview from Go Systems Programming
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The TCP handshake!
When a connection is initiated, the client sends a TCP SYN packet to the server. The TCP header also includes a sequence number field that has an arbitrary value in the SYN packet. The server sends back a TCP [SYN, ACK] packet, which includes the sequence number of the opposite direction and an acknowledgment of the previous sequence number. Finally, in order to truly establish the TCP connection, the client sends a TCP ACK packet in order to acknowledge the sequence number of the server.
Although all these actions take place automatically, it is good to know what is happening behind the scenes!
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