usually SP's don't share this information by default unless you specifically ask.
Anyway they will likely mark the traffic you define in CoS1 with a given MPLS EXP value and a lower value for CoS2. The rest will have EXP 0.
How they classify/mark the traffic is up to them; usually they use the DSCP value of your IP traffic (so it is you that decide the actual marking) or you agree with them IP based ACLs (it is not common though).
I tend to exclude they use LLQ on MPLS backbone.
2. Either you trust them or you do some test afterwards.
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