That's pretty similar to what I was asked over the phone in an interview for API support (I forget exactly what the title was) for Google Maps, I believe. I got the SYN, SYN-ACK, ACK answer; questions about sorting algorithms; and stumbled a bit on random Linux questions, even though I use it daily as my desktop OS and have administered various Linux web servers for years without issue. I guess I use the man pages too much. The recruiter didn't cut my phone interview short, but did tell me that the technical interview was going to be WAY harder and that I needed to study my Linux, low-level networking, and algorithms. It was a good interview experience to have, but left me feeling like I'd never have the knowledge to pass a technical interview there.