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An organization is trying to secure instant messaging (IM) communications through its network perimeter. Which of the following is the MOST significant challenge?
Correct Answer: C
IM clients find ways to tunnel through firewalls, creating risk. Most IM services come through well- publicized ports (5190 for AOL Instant Messenger, 1863 for MSN and 5050 for Yahoo), but IM clients also can exploit any open port on the firewall, including those used by other applications (such as Port 80 for Web and HTTP traffic). Some clients also can connect via peer-to-peer connections or establish connections on randomly negotiated ports.