how sep 12.1.5 client take the content updates

Hello Everybody,

I want to know how the sep 12.1.5 client takes incremental content updates from GUPs & symantec liveupdate server(via internet) & in which condition it will approach to GUPs & symantec liveupdate server(via internet) for incremental and full content updates. Please see the below queries also:

1. Would the sep 12.1.5 client can also download the incremental content updates(deltas) from symantec liveupdate server(via internet).

2. Would the sep 12.1.5 client can also download the incremental content updates(deltas) from GUPs.

Thanks in advance.

Regards