Secondary Site Distribution Points content flow

 
We are implementing an environment that contains over 750 locations with distribution points.  With the limitation of 250 DPs per site, we are going to have to put DPs under secondary sites.
In preparation for this configuration we would like to have a better understanding of how the content will flow to the lower level DPs (under secondary sites).  We are aware that content
being sent to a dp on a secondary site server is compressed at the primary, sent to the secondary and uncompressed.  Here are our questions:
1.  Will the content for lower level DPs, under the secondary Site, receive its content directly from the primary site DP, or the Secondary Site DP?
2.  Will the content for the lower level DPs be compressed, sent and uncompressed (from the primary or secondary)?
This information will help determine the network configuration we use to limit our WAN traffic. 
I appreciate any insight into these questions you can provide.
Thanks.

Sorry, but can someone explain #1 more detail?
I have Secondary Site with multiple DPs.
If I distribute the content to only 1 DP at Secondary site (not pull DPs), will the content distribute to the Secondary Site server first, then to the DP? Does the content also available at the SS Server?
Does the data flow like: Primary Site -> Secondary Site -> DP ?

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