'''Domain vs Path Links''' is the probability that a link on a synthetic page goes to another domain rather than to a deeper path on the same one. The choices run from 0 to 1.0.

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At 0 every page sits under one host, http://synth.web/, and pages differ only by their path, so the whole crawl is one site. At 1.0 every page is its own host, such as http://1-2.web/, so the crawl is as many sites as pages. In between, each link is decided by the probability, the same way every time for the same crawl.

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This setting is what makes a synthetic crawl exercise the parts of a crawl that depend on there being many hosts: robots files, host address lookups, and the crawl's division of its attention among sites.