5. Give the description of three online tools for footprinting, scanning, and enumeration. 6. Which type of scan is usually used to bypass a firewall or packet-filtering device? 7. Which type of scan is usually used to bypass a firewall or packet-filtering device? 8. Explain general security practice methods which a security administrator follows just after installing the webserver. 9. What is a firewall? How you will enumerate that the target computer has a firewall or not? If you find that the Linux system is not firewalled then which tool will you use to provide a firewall security to the System? 10.What is the Intrusion detection system and which tool will you use to see the intrusion detection on the machine