Italian spaghetti happen to be quite different from american ones. First, they are made only of durum wheat, and cook in 5-15 minutes. Most italians consider over-cooked pasta an edible form of glue. Second, salt is added to the water not for elevating its boiling point, but for making spaghetti more tasty.
Italian spaghetti don't taste so good with ketchup. In fact, they taste completely different from the ones you might be used to if you live in the U.S.
Also, there is no such thing like Alfredo sauce eaten in Italy.