Dealing with broken connections

[Guido Ostkamp]

Hello,

I would like to know how stable Mercurial is when it comes
deal with broken connections.

When I do a clone of a very large remote repository and 
the connection breaks in between and I have to kill
the Mercurial process which got stuck, what happens?

Am I left with a broken repository?

Can I somehow resume the cloning, for example by using
'hg pull' instead of 'hg clone' to retrieve the rest of it?

What, if I have worked on a repo, then tried to update it
using 'pull' from upstream to fetch the latest changes, 
and this pull fails in between due to broken connection?

Thanks for any insight.

Regards

Guido