Which of the following are requirements for successful VMotion migration (Choose
Two)?

A.
Gigabit Ethernet networking must exist between the source and destination hosts

B.
Virtual Machines must have access to the same subnets on the source and destination
hosts

C.
CPUs with the same clock speed and cache size must exist on both the source and
destination hosts

D.
Virtual Machines cannot be configured to use RDMs

Explanation:
vSphere Resource Management Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0Page 48.
VMotion Requirements
To enable the use of DRS migration recommendations, the hosts in your cluster must be
part of a VMotion
network. If the hosts are not in the VMotion network, DRS can still make initial
placement recommendations.
To be configured for VMotion, each host in the cluster must meet the following
requirements:
The virtual machine configuration file for ESX/ESXi hosts must reside on a VMware
Virtual Machine File System (VMFS).
VMotion does not support raw disks or migration of applications clustered using
Microsoft Cluster Service (MSCS).
VMotion requires a private Gigabit Ethernet migration network between all of the
VMotion enabled managed hosts. [A above].
Whilst it may not be an absolute requirement that virtual machines must have access to
the same subnets on the source and destination hosts for VMotion to occur, if virtual
machines do not have this access, then they can no longer communicate, thus rendering a
VMotion migration un successful. [B is correct].
Processor Compatibility
VMotion compatibility means that the processors of the destination host must be able to
resume execution using the equivalent instructions where the processors of the source
host were suspended. Processor clock speeds and cache sizes might vary, but processors
must come from the same vendor class (Intel versus AMD) and same processor family to
be compatible for migration with VMotion. [C is incorrect].
VMotion and RDMs
You can VMotion a VM that uses RDM as long as the RDM is configured in virtual
compatibility mode. [D is incorrect].