What is IID (Interface IDentifier)?

When calls are made to the QueryInterface strategy then the interface identifier (IID) is utilized. An IID is a globally unique identifier (GUID) value. Three interface ID types were initially characterized. These are: Manual, Modified EUI-64 and Random. The interface ID recognizes an interface of a specific node. An interface ID must be unique within the subnet. IPv6 hosts can utilize the Neighbor Discovery protocol to consequently produce their own interface IDs.