Most Layer 2 issues are related to some kind of loop within the domain and this has multiple problems associated with it, including network downtime. Often when you are working with switch configurations and you are plugging/unplugging a device, you should be careful that you don’t create a loop. To mitigate such problems, you should usually configure Spanning Tree Protocol on switches to avoid situations that might occur if you happen to accidently create a loop somewhere in the network. Details about Spanning Tree Protocol functionality can be found in Chapter 4.
Every switch in a network communicates . . .
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