I was wondering that too, Judith. If I don't get one I'll just go to college office and ask for one as I'm pretty sure they're the ones that sort all that stuff out.
I survived 1st and 2nd year without internet in my room though, so it's not a massive deal if I don't get a cable (and a disk as well, I've never installed all the Durham uni internet stuff on my computer before), as it's really easy to get internet access in Durham anyway.