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Other: If using other lab tools, as a few suggestions: Make sure to experiment heavily
with VLAN configuration and VLAN trunking configuration. Also, spend some time
changing interface settings like speed and duplex on a link between two switches, to
make sure that you understand which cases would result in a duplex mismatch.
Review Appendix P on the Companion Website
The previous edition of the CCNA exam blueprint included the word “troubleshoot”
as applied to Ethernet and VLANs, while the current CCNA exam blueprint does not.
Appendix P on the companion website contains a chapter from the previous edition of the
book that focused on troubleshooting. That appendix, named “LAN Troubleshooting,” can
be useful as a tool to review the topics in this part of the book. (Note that if you use this
extra appendix, you can ignore the mentions of Port Security until you have reached that
topic in the CCNA 200-301 Official Cert Guide, Volume 2.)
Watch Videos
Chapters 4 and 5 each recommend a video that can be helpful to anyone who is just learn-
ing about the Cisco CLI and basic switching concepts. If you have not watched those videos
yet, take a moment to navigate to the companion website and watch the videos (listed under
Chapters 4 and 5).
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Part II of this book introduces the basics of Ethernet LANs, both in concept and in how
to implement the features. However, the two primary features discussed in Part III of this
book—Virtual LANs (VLANs) and Spanning Tree Protocol (STP)—impact almost every-
thing you have learned about Ethernet so far. VLANs allow a network engineer to create
separate Ethernet LANs through simple configuration choices. The ability to separate some
switch ports into one VLAN and other switch ports into another VLAN gives network
designers a powerful tool for creating networks. Once created, VLANs also have a huge
impact on how a switch works, which then impacts how you verify and troubleshoot the
operation of a campus LAN.
STP—and the related and similar Rapid STP (RSTP)—acts to prevent frames from looping
around a LAN. Without STP or RSTP, in LANs with redundant links, broadcasts and some
other frames would be forwarded around and around the LAN, eventually clogging the
LAN so much as to make it unusable.
The current CCNA 200-301 exam blueprint includes exam topics for the configuration
and verification of VLANs and related topics. However, the CCNA exam topics only men-
tion RSTP concepts rather than configuration/verification. To that end, Part III opens with
Chapter 8, which goes to the configuration/verification depth with VLAN topics, followed
by Chapter 9, which introduces the concepts of STP and RSTP.
Part III closes with Chapter 10, which includes some RSTP configuration, along with Layer 2
EtherChannel configuration.
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