Which of the following is a way to get around a firewall to intrude into a secure network from a remote location?

A.
IP services

B.
Active ports

C.
Identified network topology

D.
Modem banks

Explanation:
Modem banks can provide a bypass to the firewall if the modem banks are connected INSIDE the network. The modem banks should be outside the network, for example installed in a DMZ.
Incorrect Answers:
A: The firewall should be filtering IP traffic, so IP services should not be able to bypass the firewall.
B: Active ports on the firewall should be handled by the firewall and protected. Active ports within the network are not an exposure since the firewall should prevent the passing of 1D0-470
data to those ports.
C: Knowing the network topology may help, by understanding how the network is mapped. But knowing the network does not mean that you can bypass the devices in place to protect the network, unless there are other points into the network that are not protected.