An engineer has configured a router to use EUI-64, and was asked to document the IPv6 address
of the router. The router has the following interface parameters:
mac address C601.420F.0007
subnet 2001:DB8:0:1::/64
Which IPv6 addresses should the engineer add to the documentation?
A.
2001:DB8:0:1:C601:42FF:FE0F:7
B.
2001:DB8:0:1:FFFF:C601:420F:7
C.
2001:DB8:0:1:FE80:C601:420F:7
D.
2001:DB8:0:1:C601:42FE:800F:7
In this question, the MAC address C601.420F.0007 is divided into two 24-bit parts, which are “C60142” (OUI) and “0F0007” (NIC). Then “FFFE” is inserted in the middle. Therefore we have the address: C601.42FF.FE0F.0007.
Then, according to the RFC 3513 we need to invert the Universal/Local bit (“U/L” bit) in the 7th position of the first octet. The “u” bit is set to 1 to indicate Universal, and it is set to zero (0) to indicate local scope. In this case we don’t need to set this bit to 1 because it is already 1 (C6 = 11000110).
Therefore with the subnet of 2001:DB8:0:1::/64, the full IPv6 address is 2001:DB8:0:1:C601:42FF:FE0F:7/64
0
0