Which two CPU features enable the use of 64-bit virtual machines? (Choose two.)
A. Intel VT
B. NX/XD Bit
C. Hyper-threading
D. AMD RVI
Correct Answer: AD
Explanation/Reference:
Explanation:
To support 64-bit virtualization, Intel CPUs require EM64T and VT support in the chip and in the BIOS while AMD CPUs require AMD-V/RVI.
Incorrect Answers:
B: The NX/XD setting for the CPU in the system BIOS mark memory pages as data-only to prevent malicious software exploits and buffer overflow attacks. This setting is exposed to all guest operating systems that can use it. It is not required for virtualization.
C: Hyperthreading is a technology used to allow a CPU to appear as two logical processors. It is not required for virtualization.
References: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003945
http://www.amd.com/en-us/solutions/servers/virtualization
http://pubs.vmware.com/vsphere-4-esx-vcenter/index.jsp#migrating_virtual_machines/c_nx_xd_considerations.html
Ferguson, Bill, The Official VCP5 Certification Guide, VMware Press, New York, 2013, pp 28-29
Explanation/Reference:
Explanation:
To support 64-bit virtualization, Intel CPUs require EM64T and VT support in the chip and in the BIOS while AMD CPUs require AMD-V/RVI.
Incorrect Answers:
B: The NX/XD setting for the CPU in the system BIOS mark memory pages as data-only to prevent malicious software exploits and buffer overflow attacks. This setting is exposed to all guest operating systems that can use it. It is not required for virtualization.
C: Hyperthreading is a technology used to allow a CPU to appear as two logical processors. It is not required for virtualization.
References: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003945
http://www.amd.com/en-us/solutions/servers/virtualization
http://pubs.vmware.com/vsphere-4-esx-vcenter/index.jsp#migrating_virtual_machines/c_nx_xd_considerations.html
Ferguson, Bill, The Official VCP5 Certification Guide, VMware Press, New York, 2013, pp 28-29