Design the layout of users, domains, trusted domains, anonymous users, etc for a start-up open source software company ABC. They should have an internal CVS server (only internal developers can access it), an anonymous CVS server for outsiders to download source code, a WWW server (one for internal and one for external) and an internal mail server. It is crucial that outsiders should not be able to access either internal CVS or internal WWW servers.

The design should be provide below requirements:

1. The topology diagram for the different servers and locations and trust domains. For example, where is the firewalls, and where are the users located in the topology.

2. The assumptions that you make for your design and the security policy to achieve this assumption.

3. Trust assumptions about users (e.g., who could be root, what a root could do). You do not need to create specific users, but you need to give a classification about users.

Write your response in 2000 words count.