VPN on Firewall | Buffered I/O in OS

CMIS 422 Information System Security

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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)

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