Final answer:
The minimum required settings for creating a network input in Splunk are the index name and the source type. A host is not required at input creation as Splunk can determine or assign it later.
Step-by-step explanation:
When creating a network input in Splunk, the minimum required settings you must configure include the index name and the source type. It is not mandatory to specify the host at the time of input creation -- Splunk can determine the host value from the incoming data or use the hostname of the machine that is running the Splunk instance. Thus, the correct answer is: 1) Index name and source type.