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<p>of the OSI's <a href="page.php?w=data_link_layer">data link layer</a> (layer 2) and <a href="page.php?w=physical_layer">physical layer</a> (layer 1).</p>

<p>The link layer is described in  and . RFC 1122 considers local area network protocols such as <a href="page.php?w=Ethernet">Ethernet</a> and other <a href="page.php?w=IEEE_802">IEEE 802</a> networks (e.g. <a href="page.php?w=Wi-Fi">Wi-Fi</a>), and framing protocols such as <a href="page.php?w=Point-to-Point_Protocol">Point-to-Point Protocol</a> (PPP) to belong to the link layer.</p>

<p><big>Definition in standards and textbooks</big></p><p>
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