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<a accesskey="3" href="page.php?w=IP_header&amp;p=2">3.Next</a>
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<p>An <b>IP header</b> is <a href="page.php?w=Header_%28computing%29">header</a> information at the beginning of an <a href="page.php?w=IP_packet_%28disambiguation%29">Internet Protocol (IP) packet</a>. An IP packet is the smallest message entity exchanged via the Internet Protocol across an <a href="page.php?w=IP_network">IP network</a>. IP packets consist of a header for addressing and routing and a <a href="page.php?w=payload_%28computing%29">payload</a> for user data. The header contains information about IP version, source <a href="page.php?w=IP_address">IP address</a>,</p><p>
<a accesskey="3" href="page.php?w=IP_header&amp;p=2">3.Next</a>
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