Summary

We took a deep dive into learning how redundancy can be a good but also a bad thing, as it may create a Layer 2 loop in our switch network. Most importantly, we covered the importance of understanding spanning-tree and how it works to help prevent physical redundancy from taking down our enterprise network. Having completed this chapter, you have gained the skills to determine port roles in a spanning-tree topology, configure both primary and secondary root bridges, and lastly, implement PortFast with BPDUguard.

I hope this chapter has been informative to you and is helpful in your journey toward learning how to implement Cisco solutions and prepare for the CCNA 200-301 certification. In the next chapter, Chapter 7, Interpreting Routing Components, you will learn about the importance of routing and how routers determine the best path to a destination network.