Two questions about Patches - Push or pull

Hi. I got two questions about Ivanti Patch for windows servers. Patches - Push or pull - just to be clear.

1. Does IPM zip or compress the patches and send to the Servers/Distribution Points?
2. Does IPM push the patches to Servers/Distribution Points or does the Servers pull the patches?
3. Similarly, how does the mechanism works from Distribution Points to Servers?

/Mike