Google first interview

I did the phone interview and they asked three questions:

Google: What is the default signal for the kill command?
Me: 15, it's called TERM

Google: What is the number of hosts that can be addressed with a /17 network?
Me: Um, 32 minus 17 is uh... 19
Google: 15
Me: I meant 15, so it's 2^15
Google: Minus?
Me: Minus one. I mean two! 2^15-2
Google: What are the two you subtract?
Me: Network and broadcast.

Google: What are the three default data types in Perl?
Me: Scalar, array and um...
Me: um... I can't remember...
Me: um... I can picture it. You use curly braces. I forget the name...
Google: Do you want the answer?
Me: Yes.
Google: Hash.
Me: Of course. I knew that. I swear.
Google: Well, you got two out of three, so you can go to the next step which is a 45 minute technical phone interview.