Which two options represent the most basic methods for designing a DMZ network firewall?

Single firewall: A single firewall is the simplest method for designing a DMZ network, where a firewall is placed between the internal network and the external network (internet), controlling traffic to and from the DMZ.

Dual firewall: A dual firewall setup uses two firewalls, one between the internal network and the DMZ, and the other between the DMZ and the external network. This adds an extra layer of security.