TCP SYN Cookies Question:

SYN Cookies can be used to defend against SYN flooding DoS attacks.

a. Describe how TCP SYN Cookies can defend against SYN flooding DoS attack.

b. Using a Unix-based machine, enable the SYN cookie. For your answer, include the information about where you learned how to enable SYN cookie (e.g., references to the online resources), the commands that you used, and a screen capture that shows the effect (e.g., sysctl.conf).