Ethernet Duplex Explained: How to Use the Best (Full!) and Avoid Using the Worst! @networkupskill
Ethernet Duplex Explained: How to Use the Best (Full!) and Avoid Using the Worst!  @networkupskill
Uploaded May 2025 | Updated September 2026, 3 weeks ago
Full-duplex rocks, half-duplex doesnโ€™t, and modern networks can use full-duplex everywhere. So why bother talking about half-duplex? Humans make mistakes, and automatic processes might as well. So, to be well-prepared networkers, you need to understand both half-duplex and full-duplex.

Note that this video focuses on the history and major concepts of comparing the two duplex options. Later in the CCNA video playlist, we turn our attention to the duplex issues that occur in modern networks, particularly the unfortunate case of a duplex mismatch.

๐Ÿ“˜ Matches CCNA Official Cert Guide:
*Volume 1 Chapter 2 Section 4B*


*Chapters*
00:00 Intro
01:05 The Need for Half-Duplex and CSMA/CD
08:27 Modern LANs and Full-Duplex
12:11 Duplex and the CCNA Exam
14:37 CCNA Study Group Advice


*Review*
Create a term mind map โ€“ for the whole chapterโ€™s worth of videos!!
youtube.com/TBD

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Ethernet Duplex Explained: How to Use the Best (Full!) and Avoid Using the Worst!Lab Intro: Router IP Address Config 3IPv6 Stateless Addressing Explained: SLAAC, the A-bit, and the O-bitAd Hoc Lab: Troubleshoot VLAN and Trunk IssuesConfig Lab Review: OSPF Metrics Puzzle | Can You Calculate the Right Cost?Stop Calculating Wildcard Masks: The OSPF Interface MethodProblem Isolation Using TracerouteFiber vs Copper: When to Use Fiber Optic Cables in Ethernet LANsIPv6 Link-Local Addresses: Concepts and EUI-64 RulesConfig Lab Review: DHCPv6 Relay Agent and Address Config FlagsIPv6 Unicast Address Configuration: Static, EUI-64, and Dynamic MethodsConfig Lab Review: Setting Up OSPF Routing | network Command Configuration
Wendell Odoms Network Upskill |

Ethernet Duplex Explained: How to Use the Best (Full!) and Avoid Using the Worst!

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