Enable Anonymous Access in Windows SharePoint

It's become very common now to use SharePoint servers as Web servers.
For this activity it's necessary to allow anonymous access to the SharePoint portal or a specific site collection.

The routine that required here is pretty simple, but if you miss one of the steps the result is a site that you cannot reach…

Required steps:
1. Modify authentication provider: Central Administration > Application Management > Application Security. Select the required Web Application and change the Zone to anonymous.
All sites under that Web Application are now anonymous enabled.

2. On the Site Collection: Site Action > Site Settings > Advanced Permissions
Select Anonymous Access.

SharePoint 2007 enabled us to allow Anonymous Access to Sites, Document Libraries and lists.
3. When we need to enable Anonymous Access for lists and libraries we need to check this option and browse to the lists or library.

4. From the dropdown menu on the setting tab: Permissions and Management > Permissions for this document library. Select Anonymous Access.