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 ...