In response to my application, I was sent a questionnaire by email (within a couple of days, I think). I was busy, so it took me about a week to complete and send it back. Again, within a day or two, I got a call back and an interview was scheduled.
The person scheduling the interview lacked polish, I thought, but the hiring manager was quite pleasant. Here are some of the questions I remember:
Linux
How do you stop a process in Linux? What does Ctrl-C actually do?
What is ln? What is the difference between a soft and a hard link?
Networking
What is a Default Gateway?
How does a tcp connection start up?
What do these http codes stand for 200? 401? 500?
Tell me about a difficult case you resolved.