pick any one of the 3 topics below need the paper to be 2 pages in length with a min of 2 references in apa format

Topics:

1. A co-worker with a strong Windows background is having difficulty understanding UNIX file permissions. Describe UNIX file permissions for him. Compare UNIX file permissions to Windows file permissions.

2. How are authentication and authorization alike and how are they different. What is the relationship, if any, between the two?

3. What is a VPN and what technologies are used to create one?