Someone made an argument, and then for 30+ responses it's just dumbasses trying to get around arguing. It doesn't matter who started it, fucking put some content into your posts goddamn.
Using leftist retard highschoolers as a strawman against anarchists. Not cool.
The majority of those scene/punk/emo kids,as previously mentioned, just think their wrong idea about Anarchy is cool. That has nothing to do with Anarchy, or real anarchists.
As for anarchy on a national level, it would have to be a non-hierarchical alliance for trade and defence purposes.
For international trade, you would have to work out something more, likely individual communes would have to initiate contact based on it's own communal needs. International politics would be harder, as the concept of a nation doesn't really fit with a collection of sovereign communes. You can't really give thousands of communes their own seat at the table, but there is no controlling structure overseeing all the communes, because with that hierarchy, you'd be something besides anarchist.
But it's definitely retarded to say managing anarchy on a national level is impossible.