Host multi-pathing describes a ____________ solution that has at least two distinct
______________ paths to a LUN.

A.
Token ring, physical

B.
FC SAN, virtual

C.
FC or IP SAN, virtual

D.
FC or IP SAN, Physical

Explanation:
http://en.wikipedia.org/wiki/Multipath_I/O
Fiber Channel (FC), FCoE and iSCSI encapsulate SCSI-3. FCoE and iSCSI further encapsulate
the transportwithin IP; hence the term IP SAN.
In computer storage, multipath I/O is a fault-tolerance and performance enhancement technique
whereby thereis more than one physical path between the CPU in a computer system and its
mass storage devices throughthe buses, controllers, switches, and bridge devices connecting
them.
A simple example would be a SCSI disk connected to two SCSI controllers on the same computer
or a diskconnected to two Fibre Channel ports. Should one controller, port or switch fail, the
operating system can routeI/O through the remaining controller transparently to the application,
with no changes visible to the applications,other than perhaps incremental latency.