Which of the following devices should be placed within a DMZ?

A.
Router

B.
Firewall

C.
Mail relay

D.
Authentication server

Explanation:

A mail relay should normally be placed within a demilitarized zone (DMZ) to shield the internal
network. An authentication server, due to its sensitivity, should always be placed on the internal

network, never on a DMZ that is subject to compromise. Both routers and firewalls may bridge a
DMZ to another network, but do not technically reside within the DMZ, network segment.