Final answer:
A lead can become known to Marketo by filling out a Marketo form, browsing anonymously on Munchkin-enabled landing pages, or by Marketo learning the IP address of the lead.
Step-by-step explanation:
One way a lead can become known to Marketo is by filling out a Marketo form. When a lead fills out a form on a Marketo landing page, they provide their contact information, which gets stored in the Marketo database.
Another way a lead can become known to Marketo is by browsing anonymously on Munchkin-enabled landing pages. Munchkin is a tracking script that collects information about a user's browsing behavior and attributes it to a lead in Marketo.
Marketo can also learn the IP address of a lead. This can give Marketo insights into the geographic location of the lead, which can be used for marketing and personalization purposes.