You have a mixture of servers in your datacenter where the CPUs are compatible in
every way except that some support NX or XD bit and some do not.
What should you do to minimize the effect of these differences?
A.
You mask the NX/XD bits on the servers that do not support the functionality.
B.
No action is required, as NX/XD bits are masked by default.
C.
You mask the NX/XD bits on the servers that support the functionality.
D.
You mask the NX/XD bits on the virtual machines before you VMotion them.
Explanation:
vSphere Basic System Administration vCenter Server 4.0 ESX 4.0 ESXi 4.0, page 153.
Select Advanced > CPUID Mask.
Specify whether you want to hide the host’s CPU NX flag from the guest operating
system
Hiding the NX flag prevents the guest operating system from making use of this CPU
feature, but enables the virtual machine to be moved to hosts that do not include the NX
feature. When the NX flag is visible, the guest operating system can make use of the
feature, but the virtual machine can be moved only to hosts with the NX capability.