3.5. Summary
You've covered a considerable number of topics in this chapter. Of course, it depends on what version of STP you run in your network as to which ones you find the most important. It is key that you are able to configure and work with all of them. You must be intimately familiar with STP for that purpose. Most important is STP's use in the network. You got a look at the operation of STP going back to the original version, IEEE 802.1d. You saw what had to happen for STP to operate. You reviewed the modifications and standard changes that have occurred to STP over time. There was 802.1q, also known as CST, and the changes that Cisco initiated, including PVST and PVST+. You also looked at enhancements, including PortFast, BackboneFast, ...
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