Tailored CRM / Marketo integration

Hello community!!

We are conecting a tailored CRM and Marketo and we have two questions about the servers and we need to clarify these aspects:

1. Is it possible to restrict in Marketo that the use of the API data send/download is only authorized from the IP where information is originated in order to include it as a security validation? 

2. Does our Marketo instance server answer in different IPs? We would like to know this answer in case the use of a load balancer or similar needs to be considered. 

Thank you!