What is one of the most common drawbacks to using a dual-homed
host firewall?

A.
The examination of the packet at the Network layer introduces
latency.

B.
The examination of the packet at the Application layer introduces
latency.

C.
The ACLs must be manually maintained on the host.

D.
Internal routing may accidentally become enabled.

Explanation:
A dual-homed host uses two NICs to attach to two separate networks,
commonly a trusted network and an untrusted network. It’s
important that the internal routing function of the host be disabled to
create an application-layer chokepoint and filter packets. Many systems
come with routing enabled by default, such as IP forwarding, which
makes the firewall useless. The other answers are distracters. Source:
Hacker Proof by Lars Klander (Jamsa Press, 1997).