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Concise explanations of key technical topics found on Cisco's® CCNA™, CCNP™, and CCIE™ exams
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Author: Howard C. Berkowitz

Focus: CCNA, Switching, Support & CCIE R&S;

Issue Date: May 4, 2023

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Layer 1 and Layer 2 Ethernet

An understanding of the Ethernet family is essential to passing even the most basic Cisco certification examination. This tutorial complements the CCNA "L2 Bridging and Switching" tutorial, as well as providing some updates at the CCNP and CCIE level.

The "Ethernet family" of LAN protocols has displaced every other wired LAN protocol family. It has gone through evolutions, including full duplex operation, higher transmission speeds, and inverse multiplexing, enabling it to deliver ever-increasing speeds.

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