Old Call of Duty on Xbox one server or Xbox 360 server?

Br
- in Xbox
1

Go through the same or different servers

Br

When you play Xbox 360 games on your Xbox One, you get to the Xbox 360 server as normal.

Back then I gambled online with a buddy Left 4 Dead. He on his 360 and I on my One.

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Xbox dirty?

Xbox dirty?
Is there something wrong with the internet here? Is it very slow?

Is there something wrong with the internet here? Is it very slow?