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Copy and Paste the following code into a new blog post... <div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="clipmarks' clip-to-blog"><img src="http://content.clipmarks.com/blog_embed/dee64870-a628-46bb-8e75-31e916f48758/69AB4354-5063-4250-AD96-624785EBB58D/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://en.wikipedia.org/w/index.php?title=Transmission_Control_Protocol&oldid=191717777" href="http://en.wikipedia.org/w/index.php?title=Transmission_Control_Protocol&oldid=191717777" style="font-size: 11px;">en.wikipedia.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Transmission_Control_Protocol&oldid=191717777"><P>A TCP segment consists of two sections:</p> <UL> <li style="margin-left:16px;padding-left: 0px;">header</LI> <li style="margin-left:16px;padding-left: 0px;">data</LI> </UL> <P>The TCP header<A rel="nofollow" title="http://freebie.fatpipe.org/~mjb/Drawings/TCP_Header.png" class="external autonumber" href="http://freebie.fatpipe.org/~mjb/Drawings/TCP_Header.png">[2]</A> consists of 11 fields, of which only 10 are required. The eleventh field is optional (pink background in table) and aptly named "options".</p> <TABLE class="wikitable"><CAPTION>TCP Header</CAPTION> <TBODY><TR><TH>Bit offset</TH><TH width="11%" colspan="4">Bits 0–3</TH><TH width="11%" colspan="4">4–7</TH><TH width="22%" colspan="8">8–15</TH><TH width="44%" colspan="16">16–31</TH></TR><TR><TD><B>0</B></TD><TD colspan="16">Source port</TD><TD colspan="16">Destination port</TD></TR><TR><TD><B>32</B></TD><TD colspan="32">Sequence number</TD></TR><TR><TD><B>64</B></TD><TD colspan="32">Acknowledgment number</TD></TR><TR><TD><B>96</B></TD><TD colspan="4">Data offset</TD><TD colspan="4">Reserved</TD><TD colspan="1">CWR</TD><TD colspan="1">ECE</TD><TD colspan="1">URG</TD><TD colspan="1">ACK</TD><TD colspan="1">PSH</TD><TD colspan="1">RST</TD><TD colspan="1">SYN</TD><TD colspan="1">FIN</TD><TD colspan="16">Window</TD></TR><TR><TD><B>128</B></TD><TD colspan="16">Checksum</TD><TD colspan="16">Urgent pointer</TD></TR><TR><TD><B>160</B></TD><TD bgcolor="#ffdddd" colspan="32">Options (optional)</TD></TR><TR><TD><B>160/192+</B></TD><TD colspan="32"> Data </TD></TR></TBODY></TABLE><UL> <li style="margin-left:16px;padding-left: 0px;">Source port (16 bits) – identifies the sending port</LI></UL></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/69AB4354-5063-4250-AD96-624785EBB58D/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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clipped from en.wikipedia.org

A TCP segment consists of two sections:

header

data

The TCP header[2] consists of 11 fields, of which only 10 are required. The eleventh field is optional (pink background in table) and aptly named "options".

TCP Header
Bit offset Bits 0–3 4–7 8–15 16–31
0 Source port Destination port
32 Sequence number
64 Acknowledgment number
96 Data offset Reserved CWR ECE URG ACK PSH RST SYN FIN Window
128 Checksum Urgent pointer
160 Options (optional)
160/192+ Data

Source port (16 bits) – identifies the sending port

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