CMIS 422 Information System Security
Answered
Task:
Question 1 (60 Marks):
Normally firewalls provide virtual private networks.
1. Explain step-by-step how to set up a VPN on a firewall of your choice. Provide a detailed example (30 marks).
2. Why is a firewall a good place to implement a VPN? (15 Marks)
3. Why not implement it at the actual server(s) being accessed? (15 Marks)
Question 2 (40 Marks):
Some operating systems perform buffered I/O. In this scheme, an output request is accepted from a user, and the user is informed of the normal I/O completion. However, the actual physical write operation is performed later, at a time convenient to the operating system.
First, list the operating systems which perform buffered I/O (20 Marks).
Second, discuss the effect of buffered I/O on integrity in a DBMS (20 Marks).
Please provide references (Books & Internet websites)