Questions: Which of the following is another name for a firewall that performs router functions? Dual-homed gateway Screening router Screened subnet Screened-host gateway

The answer is the second one: Screening router.

Explanation for each option:

1. Dual-homed gateway: This is a type of firewall architecture that uses a system with two network interfaces, one connected to the internal network and the other to the external network. It is not specifically known for performing router functions.

2. Screening router: This is another name for a firewall that performs router functions. A screening router is a router configured to filter packets based on a set of rules, effectively acting as a firewall by controlling the flow of traffic between networks.

3. Screened subnet: This refers to a network architecture where a subnet is protected by a firewall, typically involving multiple layers of security. It is not specifically a term for a firewall that performs router functions.

4. Screened-host gateway: This is a firewall architecture where a single host is protected by a firewall, often used in conjunction with a screening router. It is not specifically a term for a firewall that performs router functions.

In summary, a screening router is a firewall that also performs routing functions, making it the correct answer.