A multihomed firewall refers to a firewall with two or more network interfaces (NICs), each connected to different network segments. The purpose of a multihomed firewall is to allow filtering and segmentation of traffic between multiple network zones, such as:
External network (e.g., Internet)
Internal network (e.g., LAN)
To qualify as multihomed, the system must have at least two network interfaces. This allows it to sit between two networks and inspect/filter traffic passing through it.
Reference – CEH v13 Official Study Guide:
Module 13: Evading IDS, Firewalls, and Honeypots
Section: Firewall Architecture
Quote:
“A multihomed firewall is a system with two or more NICs connected to different networks, typically used to control traffic between internal and external networks. The minimum number of interfaces is two.”
Incorrect Options Explained:
A. 3 interfaces may be used in advanced setups (e.g., with a DMZ), but not the minimum.
B & C. 4 or 5 connections are not required unless designing more complex segmentation.
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