A Citrix Administrator is unable to create desktop OS machines using Machine Creation Services.
What is a possible cause of the issue?

A.
Citrix Director is unreachable.
B.
DHCP is NOT working correctly.
C.
The Machine Identity Service is NOT running.
D.
Antivirus software on the Delivery Controller is blocking the creation.
Explanation:
The Citrix Machine Identity Service is not available in XD 7.x The functionality has been merged with Citrix Machine Creation Service.
http://support.citrix.com/article/CTX139415
The question doesn’t state the version of XD but we can assume XD7.
Most likely B, I don’t think it will prevent creating a machine but the machine will not receive IP address and will not be able to register with controller.
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the question does not mention the version of XD but while this is an exam for XD 7 answer C is wrong. Citrix Machine Identity Service was for XD 5.x and not for XD 7.x. The correct answer is B. MCS requires ans will enforce use of DHCP. If you can’t use DHCP then you can’t use MCS to provision machines and will have to create them manually.
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This question is not for XD 7.x.
Even if the DHCP is not working properly you would be able to create machines but couldn’t register created machines.
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MCS requires and will enforce use of DHCP. If you can’t use DHCP then you can’t use MCS to provision machines and will have to create them manually.
http://discussions.citrix.com/topic/350172-mcs-created-windows-2012-r2-server-how-to-assign-ip-addresses/
you won’t be able to use any of the machine provisioning mechanisms that XenDesktop provides. Provisioning Services and Machine Creation Services both rely on having dhcp to allocate unique ip addresses for the machines. So, you’ll have to create the machines yourself and assign them static addresses and then import them into the appropriate catalog type.
http://discussions.citrix.com/topic/353997-xendesktop-without-dhcp/
http://discussions.citrix.com/topic/349141-automatic-ip-address-assignment-in-citrix-xendesktop/
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Correct answer is C
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