Nsurlsessiond - what is this and why does it use alot of data?

Hello
Firstly
I was in a public library, uploading to my dropbox account, and all of sudden my network speed indicator/ montior showed heaps of download and fast too.
but i was not downloading anything.
I was upping to my dropbox account.
In activity monitor i noticed this service was operating "nsurlsessiond"
What is this service?
In my connection alert it tells me nsurlsessiond tried to establish a connection to apple-dnld.vo.llnwd.net on TCP port 80 (http)
Secondly, i was using my own wifi, and saw this nsurlsessiond service consuming heaps of data. Again I was upping to my dropbox account. About 1gb this time.
Now I have blocked communciation to "nsurlsessiond"
What is the impact of blocking such communication?
please see details of service in screenshot
Now after this experience, I am wondering is it apple policy to have communication from our macbook's to somwhere without us knowingly allowing it? I thought apple was respective of our privacy, or has this changed?
thankyou for your help and time.
regards
10.10.2
dropbox v3.4.4
macbook pro
Message was edited by: seaseasea added screenshot
Message was edited by: seaseasea
added device and osx

i couldnt say. it was just that i happen to be only upping, to dropbox, and then saw downloading on the monitor.
that was triggered as odd.
i rarely look at what services are going on... only if my macbook slows down or something else odd.
in both cases i was only upping to dropbox.
i dont do alot with my macbook, other than upping to dropbox laterly.
thankyou for your thinking and help.

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