You have two servers named Server1 and Server2 that run Windows Server 2012 R2. Server1 has the
DHCP Server server role installed.
You need to create an IPv6 reservation for Server2.
Which two values should you obtain from Server2? (Each correct answer presents part of the
solution. Choose two.)

A.
the hardware ID
B.
the DHCPv6 unique identifier
C.
the DHCPv6 identity association ID
D.
the SMSBIOS GUID
E.
the MAC address
Explanation:
The Add-DhcpServerv6Reservation cmdlet reserves a specified IPv6 address for the client identified
by the specified Dynamic Host Configuration Protocol (DHCP) v6 unique identifier (ID) (DUID) and
identity association ID (IAID).
B + C are indeed the correct options.
You would reserve IPv6 using the command line Add-DhcpServerv6Reservation, which requires 2 values to work,the unique ID (UID) and the identity association ID (IAID).
https://technet.microsoft.com/en-us/library/jj590730(v=wps.630).aspx
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BTW you can find the DUID and IAID in the Ethernet adapter Internet: of IPCONFIG /ALL
the last 6 octets of the DUID is also the MAC address
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