Install Windows Server 2012 R2 - MCSA Windows Server 2012 R2: Installation and Configuration Study Guide - page 47

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The Enable check box is used to indicate the status of the discovery domain sets
and to turn them off and on.

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Create is used to create new discovery domain sets.

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Refresh is used to repopulate the Discovery Domain Sets drop-down list.

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Delete is used to delete the currently selected discovery domain set.

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Add is used to add discovery domains to the currently selected discovery domain set.

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Remove is used to remove selected nodes from the discovery domain sets.

13. Close the iSNS server.

Fibre Channel

Fibre Channel storage devices are similar to iSCSI storage devices in that they both allow
block-level access to their data sets and can provide MPIO policies with the proper hard-
ware configurations. However, Fibre Channel requires a Fibre Channel HBA, fiber-optic
cables, and Fibre Channel switches to connect to a storage device.
A World Wide Name (WWN) from the Fibre Channel HBA is used from the host and
device so that they can communicate directly with each other, similar to using a NIC's
MAC address. In other words, a logical unit number (LUN) is presented from a Fibre