Network Administration
Routing protocols
Routers
Switches
Vpn
Actually I was born to become a theoretical physicist (so I thought) and ended up working in ICT. I started with networking and network security, I worked on virtualization, exploring the performance of different techniques and software.
I'm still passionate about cosmology, but now also about network administration. You know, networks are platforms-indepedents: this is a good thing about about them.
By the way, I'm thinking about writing a book, because I haven't found any talking about what I have to say.