Class Of Service: Packet or Session

Hello,

I'm starting with CoS on a MX104 and reading the CoS Guide.

1 - When I use the firewall filter to classifiy the input of an interface, is the CoS for the whole session or just the packet?

2 - The classification has to be in the interface where the packets are dropped when the limit of that interface is reached?

ISP ---(10G)--- MX104 ---(20G)--- distribution-network

Thanks.