In summary, here are 10 of our most popular spanning+tree+protocol courses

• Cisco Software-Defined Wan for Enterprise and Cloud: Pearson
• Implementing Cisco MPLS: Cisco Learning and Certifications
• Foundations of Networking and Cisco Device Management: Packt
• Configuring BGP on Cisco Routers: Cisco Learning and Certifications
• CompTIA Network+ (N10-009) Crash Course: Packt
• CCNA v1.1 (200-301) Video Training Series: Packt
• CCNA: Networking Basics, Switching, Addressing, and Routing: Logical Operations
• Point-to-Point Wireless Telecommunication Links: The University of Notre Dame
• Fundamentals of Network Communication: University of Colorado System
• Overview of Important Protocols: Cisco Learning and Certifications