I am a huge fan of packet analysis to ensure your network devices are configured and behaving as you expect them to be.
In this video, I analyze multicast and broadcast packets, focusing on two Cisco routing protocols -- HSRP and EIGRP -- as well as Spanning Tree Protocol (STP) and Cisco Discovery Protocol (CDP). Specifically, I go over some of the protocol contents, what they mean and what you might want to tune.
As you go through packets, it's important to ask yourself the following questions:
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