Melissa’s organization has deployed a firewall that uses three interfaces to provide services. The first interface connects to the Internet, the second to a network where the organization’s web servers reside, and the third to a secured network where the organization’s workstations are connected. What type of firewall architecture has Melissa’s organization deployed?

Screened subnet designs use a firewall with three interfaces, one for the Internet or an untrusted network, one for a protected but front-facing network, and one for a shielded or protected network. ACLs (access control lists) use rules to control access. This design may use ACLs, but an ACL alone does not describe it. Binary firewalls were made up for this question, and while an NGFW may be multihomed, “multiroute” is not a term used to describe this design.