Please complete the lab exercises in the '25-1 STP Troubleshooting Lab Exercises.zip' file which is attached here.

NOTE THAT THE TROUBLESHOOTING LAB IS COMPLETED BEFORE THE CONFIGURATION LAB FOR THIS SECTION.

Contents:
Lab Exercise PDF. 
Answer Key PDF.
Packet Tracer startup configuration.
Startup configuration text files for if you have a physical lab.
Lab topology diagram.