Bill is an IT security consultant who has been hired on by an ISP that has recently been plagued by numerous DoS attacks. The ISP did not have the internalresources to prevent future attacks, so they hired Bill for his expertise. Bill looks through the company’s firewall logs and can see from the patterns that the attackers were using reflected DoS attacks. What measures can Bill take to help prevent future reflective DoS attacks against the ISP’s network? (Select 2)