Router R1 has an interface named Gigabit Ethernet 0/1, whose MAC address has been set to 5055.4444.3333. This interface has been configured with the ipv6 address 2000:1:1:1::/64 eui-64 subcommand. What unicast address will this interface use?
- 2000:1:1:1:52FF:FE55:4444:3333
- 2000:1:1:1:5255:44FF:FE44:3333
- 2000:1:1:1:5255:4444:33FF:FE33
- 2000:1:1:1:200:FF:FE00:0
Explanation: With the eui-64 parameter, the router will calculate the interface ID portion of the IPv6 address based on its MAC address. Beginning with 5055.4444.3333, the router injects FF FE in the middle (5055.44FF.FE44.3333). Then the router inverts the seventh bit in the first byte. Mentally, this converts hex 50 to binary 01010000, changing bit 7 so that the string is 0101 0010 and converting back to hex 52. The final interface ID value is 5255:44FF:FE44:3333. The wrong answers simply list a different value.
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