I have instaled a network in a enterprise and now i need to past to a paper the structure off the network. There exist some software to do this?

Try WhatsUp Gold.

It detects all the servers and computers and places/connects them on a diagram, and you can also detect errors and such too

YAY

The Dude looks cool.

Thanks TAiN.

Tahnks by the help, the programs WhatsUP Gold and The Dude are very good. But i just whant a program to do a diagram like the image but more complex. Thanks

Create your own using Visio

Microsoft even makes an enterprise addon where Visio will make it for you, similar to how The Dude maps one out. I've been messing around with The Dude (don't like how that sounds) for a little while now and I'm pretty impressed with it. While it doesn't quite have all of the features or all of the polish that Fluke OptiView has, it's also about $25,000 cheaper.

Thanks for the help, im using Visio and is very good.