Which feature should you deploy?

You manage an environment that has many servers. The servers run Windows Server 2012 R2 and use iSCSI
storage. Administrators report that it is difficult to locate available iSCSI resources on the network. You need to
ensure that the administrators can locate iSCSI resources on the network by using a central repository. Which
feature should you deploy?

A.
The iSNS Server service feature

B.
The iSCSI Target Storage Provider feature

C.
The Windows Standards-Based Storage Management feature

D.
The iSCSI Target Server role service

Explanation:
http://technet.microsoft.com/en-us/library/cc772568.aspx
iSNS Server Overview
Internet iStorage Name Service Server
The Internet Storage Name Service (iSNS) protocol is used for interaction between iSNS servers and iSNS
clients. iSNS clients are computers, also known as initiators, that are attempting to discover storage devices,
also known as targets, on an Ethernet network. iSNS facilitates automated discovery, management, and
configuration of iSCSI and Fibre Channel devices (using iFCP gateways) on a TCP/IP network. Note The
Microsoft iSNS Server only supports the discovery of iSCSI devices, and not Fibre Channel devices. iSNS
Server provides intelligent storage discovery and management services comparable to those found in FibreChannel networks, allowing a commodity IP network to function in a similar capacity as a storage area network.
iSNS facilitates a seamless integration of IP networks and manages iSCSI devices. iSNS thereby provides
value in any storage network comprised of iSCSI devices.
Features of iSNS Server iSNS Server is a repository of currently active iSCSI nodes, as well as their associated
portals, entities, etc. Nodes can be initiators, targets, or management nodes. Typically, initiators and targets
register with the iSNS server, and the initiators query the iSNS server for the list of available targets.
A dynamic database of the iSCSI devices and related information that are currently available on the network:
The database helps provide iSCSI target discovery functionality for the iSCSI initiators on the network. The
database is kept dynamic by using the Registration Period and Entity Status Inquiry features of iSNS.
Registration Period allows the server to automatically deregister stale entries. Entity Status Inquiry provides the
server a functionality similar to ping to determine whether registered clients are still present on the network, and
allows the server to automatically deregister those clients which are no longer present. State Change
Notification Service: This allows registered clients to be made aware of changes to the database in the iSNS
server. It allows the clients to maintain a dynamic picture of the iSCSI devices available on the network.
Discovery Domain Service: This allows an administrator to assign iSCSI nodes and portals into one or more
groups called discovery domains. Discovery domains provide a zoning functionality by which an iSCSI initiator
can only discover those iSCSI targets who have at least one discovery domain in common with it. Benefits of
iSNS Server in iSCSI Storage Area Networks Centralized management Easily scalable to large IP storage
networks
Extensible
Asynchronous notification of changes in the iSCSI storage network Ability to monitor the status and availability
of clients Microsoft-preferred discovery method for iSCSI
Designed for Windows Logo Program requirement for iSCSI HBAs