CS Networks interview questions

It was very surprising experience. I have applied via job ad. Two weeks after, i got a schedule for an interview. Instead of standard set of questions in regards to my education and previous experience, i was served with a coffee and given an empty office with a computer. I got a peace of paper with some very tight industry related technical problems to resolve. They told me i may use help of internet and google, or whatever i prefer in order to come up with a solution. They were very friendly and told me there is no time limit - as well as free pizza if i get hungry. I spent about 2 hours, and got back with a solutions. After that we spent about 30 minutes introducing with staff members. They told me, i will be informed about outcome in a week, no matter what the decision will be. 4 days after, i got official offer for a position of junior system administrator - which i accepted.