6. Give an example of a recursively copying a directory from one location to another.
8. Give an example of a set of shell commands that will give you the number of "httpd" processes running on a Linux box.
14. What is the difference between a hub, switch, and a router? What are the security advantages of switch vs. hub?
15. Show an example of using telnet to learn the headers of an http server.
18. Given a DNS server that has just started (with an empty cache) and host contacting this DNS server (using it's OS setting) to learn an address for google.com, list the steps the DNS server will take to learn it with IP addresses (each step will have multiple possible IP addresses – you need choose only one per step).