An external attacker has compromised an organization-s ne

twork security perimeter and installed a sniffer onto an inside computer. Which of the following is the MOST effective layer of security the organization could have implemented to mitigate the attacker-s ability to gain further information?

A. Implement p

acket filtering on the network firewalls

B. Install Host Based Intrusion Detection Systems (HIDS)

C. Require strong authentication for administrators

D. Implement logical network segmentation at the switches