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CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

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Exam Essentials

Remember the three switch functions. Address learning, forward/filter decisions, and loop avoidance are the functions of a switch.

Remember the command show mac address-table. The command show mac address-table will show you the forward/filter table used on the LAN switch.

Understand the main purpose of the Spanning Tree Protocol in a switched LAN. The main purpose of STP is to prevent switching loops in a network with redundant switched paths.

Remember the states of STP. The purpose of the blocking state is to prevent the use of looped paths. A port in listening state prepares to forward data frames without populating the MAC address table. A port in learning state populates the MAC address table but doesn’t forward data ...

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