Which secure network design element creates a buffer zone that separates public-facing services from an organization's internal network to limit the impact of external attacks?
A virtual local area network (VLAN)
Network address translation (NAT)
A demilitarized zone (DMZ)
An intrusion detection system (IDS)
A demilitarized zone (DMZ) places servers that must be accessible from the internet-such as web or email servers-into a separate perimeter subnet. Traffic from untrusted networks reaches only the DMZ, keeping the internal LAN isolated if those servers are compromised. A VLAN merely creates logical segmentation within a LAN and does not inherently protect public-facing systems. Network address translation (NAT) hides internal IP addresses but does not provide a dedicated isolation zone. An intrusion detection system (IDS) monitors traffic for malicious activity but is not a network segment; it does not create a buffer between public and private resources.
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