Computer Science

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?

Please note that the requirement here is to write a 1 -2 (500 – 750 words) page paper. Be sure to include at least two reference sources. APA rules for formatting, quoting, paraphrasing, citing, and listing of sources are to be followed.