I was contacted by a recruiter on LinkedIn. I first had a really quick phone call + technical screening with the recruiter (port numbers, shell commands...). After that was a 2-question coding interview over the phone, which I believed didn't go so well, even though the questions were easy (think first CS college course level), but I passed anyway. Next, I had another technical phone call on systems (kernel, shell commands, basic troubleshooting...). I was then invited to fly over to California for an on-site interview, which I was really excited about. I stayed in a pretty nice hotel, and everything was paid for by FB. On-site, I had 5+ interviews with engineers, managers, and recruiters, which were similar to the phone interviews, just a little deeper/harder. I also had the opportunity to tour the FB campus, which looked great... nice office space, lots of free perks, great people... I had an offer about a week later and accepted. You don't often get to work for one of the biggest/greatest/most traffic website/platform.

Explain everything that happens over the network when a client tries to access a website.