Assignment 4

On chapters 8 and 9

Due: September 15, 2009, Midnight EST

Total: 40

Important Note:

· Do not give URL or link in your answer. Write in your own language.

· If you get information from some Internet site, you may want to include the website as a reference. But your answer must contain complete explanation or rationale in your own language.

1.  How will you implement antispoofing and directed broadcast filters in your router? Search and find out. Then write a brief description of the procedure.    5 pts

2.   In a classic DoS flood attack, an attacker floods a system by with ICMP echo request packets of size 200 bytes each. If the attacker uses a  2 Mbps link, how many such packets must she send to flood the system?   5 pts

3.  Solve questions 9.5, 9.6 and 9.7 from the text book (page 300-301).  10 points each

*** The text book has excellent problems on chapter 9. Try to solve all the problems. You will learn a lot. ****