TCP Handshakes
To allow two hosts to communicate and exchange data reliably, TCP performs a three step handshake before any of the data is sent. This is when TCP guarantees that the data will arrive in tact by using a sequence and acknowledgement numbers. After all data is sent, TCP then performs a four step shutdown that concludes the session.
Three Step Startup
|
PC |
—————- SYN —————-> |
Server |
| <———— SYN ACK————– | ||
| —————- ACK —————-> |
Four Step Shutdown
|
PC |
—————FIN ACK ————-> |
Server |
| <—————ACK—————— | ||
| <———— FIN ACK————— | ||
| —————- ACK —————-> |
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This entry was posted on Sunday, July 9th, 2006 at 2:38 pm
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