Suppose that Scratch, an online retailer, is subjected to a distributed denial of service (DDOS) attack. Scratch web retail system is comprised of 100 web servers and the attacker recruits 50 zombie devices to constantly send 60-byte SYN packets to the Scratch web servers. Suppose that each of Scratch servers maintains a table for 256 TCP connection requests, and that in response to a SYN, these servers send a SYN-ACK packet four times, at t = 32 second time intervals, then purge the request from the table if no reply is forthcoming.

1) What is the total connection capacity of Scratch servers?

2) In packets/second what is the rate at which SYN packets will fill Scratch connection tables?

3) How many packets/second does each zombie therefore need to send?

4) How much bandwidth does each zombie need?