Describe the purpose of a mac address

1.  Why does FDDI have counter rotating rings? Be sure to provide details why it uses them, not only why it has a second ring, but specifically why counter-rotating. Provide details what that provides, and how it uses them.
2.   What are the two primary signaling methods for networks? What are the main differences and where is one used versus the other?

3.   Describe the purpose of a MAC address, where it is used, and a specific example of a specific address itself.

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