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What is the multicast Ethernet address for IP address 227.128.64.12?

CCNP Interview Question
CCNP Interview Question

Answer:

The base Ethernet multicast address is 01 00 5E 00 00 00. The first byte of the IP multicast address is not used. If the second byte is greater than 127, subtract 128, giving a value of 0. The third and fourth bytes of the IP address are used as is after converting to hex. Their values, in hexadecimal, are 40 and 0C. So the Ethernet multicast address for the IP multicast address 227.128.64.12 is 01 00 5E 00 40 0C.

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Explain the difference between dense mode and sparse mode multicast.Determine at least four IP multicast groups that have the multicast Ethernet address of 01 00 5E 00 40 0C?