What is the purpose of a DMZ in network security? Learn how a DMZ provides a buffer zone between internal and external networks, protecting sensitive resources from direct exposure—essential for Cisco Certified Support Technician (CCST) Networking 100-150 exam success.
Table of Contents
Question
What is the purpose of a DMZ in network security?
A. Hides internal IP addresses
B. Speeds up network traffic
C. Encrypts all data transfers
D. Assigns VLANs dynamically
E. Provides a buffer zone between internal and external networks
Answer
E. Provides a buffer zone between internal and external networks
Explanation
A DMZ (Demilitarized Zone) is used for public-facing services, isolating them from the internal network.
The purpose of a DMZ (Demilitarized Zone) in network security is to provide a buffer zone between internal and external networks.
A DMZ is a physical or logical subnetwork that separates a company’s internal local area network (LAN) from untrusted external networks, typically the public internet.
Public-facing servers and services—such as web, email, DNS, and FTP servers—are placed in the DMZ so they can be accessed by external users without exposing the internal network directly.
The DMZ acts as a security barrier, ensuring that even if a public-facing server is compromised, attackers cannot easily move into the internal network. This segmentation is often enforced with one or two firewalls, which strictly control and monitor traffic between the internet, the DMZ, and the internal LAN.
The buffer zone provided by the DMZ reduces the risk of reconnaissance, IP spoofing, and direct attacks on sensitive internal systems, as attackers must bypass multiple layers of security to reach private resources.
If a breach occurs within the DMZ, internal firewalls and access controls help contain the threat, protecting the core network and sensitive data.
A DMZ isolates public services from the internal network, creating an additional security layer that protects private resources from direct exposure to external threats.
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