Why can instant messaging (IM) and peer-to-peer (P2P) applications be considered a threat to network security?

Why can instant messaging (IM) and peer-to-peer (P2P) applications be considered a threat to network security?
A . Because they use ports above 1023 and many firewalls are not configured to block this traffic
B . Because they are susceptible to VLAN hopping
C . Because they usually lie outside the broadcast domain
D . Because they use ports below 1023 and many firewalls are not configured to block this traffic

View Answer

Answer: A