Which of these methods allows an organization to expose a single TCP/IP address to the Internet while utilizing private IP addressing across the LAN?
  1. Extranet
  2. VLAN
  3. DMZ
  4. NAT
Explanation
Answer: D - Network Address Translation (NAT) allows an organization to present a single address to the Internet.

Key Takeaway: Network Address Translation is the process of modifying network address information in datagram packet headers for the purpose of remapping a given address space into another. The NAT router maps all inbound and outbound requests and maintains a table for returned messages. It helps improve security by not allowing outside traffic to access the internal network directly.
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