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<p>1: <a href="page.php?w=physical_layer">physical layer</a> PDU is the <a href="page.php?w=bit">bit</a> or, more generally, <a href="page.php?w=Symbol_%28data%29">symbol</a>.</p>

<p>Given a context pertaining to a specific OSI layer, PDU is sometimes used as a synonym for its representation at that layer.</p>

<p><big>Internet protocol suite</big></p>
<p>Protocol data units for the <a href="page.php?w=Internet_protocol_suite">Internet protocol suite</a> are:</p>

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*The <a href="page.php?w=transport_layer">transport layer</a> PDU is the <a href="page.php?w=TCP_segment">TCP segment</a></p><p>
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