i am waleed i am study the master and i must build a new feature with firewall now i must work with application layer and network layer therefor i need source code for simple personal firewall then i develop it
well I don't know a good translation but it should be something like commercial engineer with a major in computer science. But it's very theoretical not much hands on things to do The studies take 5 years so that should be something like a masterdegree I think.
Most importance went out to economics and stuff then after three years I chose to specialize in computer science . Really regretted I dind't choose to study computer science in the beginning. Cause the things that really interest me like security, networking, operating systems, ... are just treated superficially
You might also try observing some firewalls like ZoneAlarm with programs like dependency walker to see which dll's they use under windows. The more you understand about the working of those firewalls the better the one you build we be.
You sure your not related to Sahir in any way ? If you think you made a bad moving studying economics and changing to CS later on, you should ask Sahir about his experience ! He's got a full degree in economics and he's our Security advisor!
It just come to show that if you like doing something, then do it and you'll certainly excel in it!