Uploaded May 2025 | Updated September 2026, 3 weeks ago

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Full-duplex rocks, half-duplex doesn’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.

📘 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 – for the whole chapter’s worth of videos!!
youtube.com/TBD

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*Product Links*
Product links below. I make a small affiliate sales commission if you buy something!

CCNA Library (Two Book Set):
📚 ccna.link/nu-cp-lib-ed2

All CCNA products at Cisco Press:
🖨️ ccna.link/nu-cp-allccna

All Wendell's products at Cisco Press:
🧔🏼‍♂️ ccna.link/nu-cp-allwo

Ciscopress.com/NewCerts Page (News, Announcements):
📰 ccna.link/nu-cp-newcerts
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