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. When you are working with switch configuration and are plugging/unplugging a device, you should make sure that you aren’t creating a loop in the process. To mitigate against such problems, you should usually configure Spanning Tree Protocol on switches in order to avoid situations that might occur if you happen to accidently create a loop somewhere in the network.
Every switch in a network is communicating using MAC addresses. As packets come in . . .
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