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Layer 2 Switching
For the CCNA candidate, this study guide covers basic Layer 2 bridging and
switching technologies; examines Cisco's Catalyst series line of LAN
switches; and provides an introduction to installing, configuring, and
troubleshooting the Cisco Catalyst 1900 series LAN switch.
STP Supplement (by Mike Sweeney)
The Spanning Tree Protocol (STP) is a layer 2 process that is discussed separately as a special focus. STP prevents bridge loops in the network by calculating optimal pathways to the root bridge and then blocking ports that have redundant paths.
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