When using a Hardware iSCSI Initiator with an ESX/ESXi Host, which of the following tasks is
performed by the VMkernel (Choose Two)?

A.
Mapping requests for blocks on the virtual disk to blocks on the appropriate physical device

B.
Issuing SCSI commands to the virtual disk

C.
Encapsulation of I/O requests into iSCSI Protocol Data Units (PDUs)

D.
Encapsulation ofiSCSI PDUs into TCP/IP packets

Explanation:
Using HW iSCSI adapter it will offload from the VMkernel to the HW iSCSI adapter:

Encapsulation of iSCSI PDUs TCP/IP packets
and
Encapsulation of I/O requests into iSCSI Protocol Data Units (PDUs)

Hence the VMkernel does not perform these two tasks making these the correct answers:

Mapping requests for blocks on the virtual disk to blocks on the appropriate physical device
and
Issuing SCSS commands to the virtual disk

Page 68 from vsphere-esxi-vcenter-server-50-storage-guide.pdf