ASP.NET MVC User routing like that in StackOverflow?

Question

I\'ve looked at the routing on StackOverflow and I\'ve got a very noobie question, but something I\'d like clarification none the less.

I\'m looking specifically at

Answer 1

Without a SO developer giving a definite answer, reverse engineering could yield many possible combinations and permutations. Here's one that I think would fit too:

routes.MapRoute(
    "UserProfile",
    "Users/{id}/{slug}",
        new { controller = "Users", action = "Profile" }
);

routes.MapRoute(
    "UserLogin",
    "Users/Login",
    new { controller = "Users", action = "Login" }
);

routes.MapRoute(
    "DefaultUser",
    "Users",
    new { controller = "Users", action = "Index" }
);