IIS has the concept of a Clear Text logon. The name is due to the fact that IIS has access to both the username and password in clear text. You can control whether a Clear Text logon creates a Network, Interactive, or Batch token by setting the LogonMethod property in the metabase. By default, Clear Text logons get an Interactive token and have access to network resources. The LogonMethod can be configured at the server, site, virtual directory, directory, or file level.
Anonymous access impersonates the account configured as the anonymous user for the request.
Tokens created in this manner are network tokens which will NOT have access to other computers on the network. If you disable Automatic Password Synchronization, IIS creates the token in the same manner as the Clear Text logon mentioned previously. Therefore, if you change your anonymous account to a domain account, you will not be able to use Automatic Password Synchronization and you will get a clear text logon. The exception is if you install IIS on your Primary Domain Controller, in which case, the domain accounts are on the local computer. The anonymous account and the Automatic Password Synchronization option can be configured at the server, site, virtual directory, directory, or file level.